` tag. If you are on a\nMac, turn on VoiceOver with Cmd + F5 and then press\nCtrl + Opt + Cmd + h to jump to\na heading.\n",code:"
A real heading
\n"},{title:"Unsemantic Heading exercise",description:"The heading below is a fake heading made to look like a heading with an\nunsemantic `
`. Change the `
` below to use an `
` tag. Now verify your semantic heading using the Verify button as well as\nwith VoiceOver.\n",code:'
\n A fake heading\n
\n',assertion:"assert(\n dom.querySelector('h3'),\n \"It doesn't look like you converted the div to a real heading.\"\n);\n"}]}},content:"Headings provide structure to a page. A person using a screen reader can\nnavigate a page quickly using headings on the page if the headings used are\nsemantic. Semantic headings include real heading tags such as `h1`, `h2`.\n",pathHash:"98c85cba9fc00ffd3ebfd95b418ce09e",contentConverter:r,layout:o}},function(e,t,n){(function(e){"use strict";function r(e){return e&&e.__esModule?e:{"default":e}}function o(t){var n=e.document.createElement("div");return n.innerHTML=t,n}Object.defineProperty(t,"__esModule",{value:!0});var i=n(4),a=r(i),s=n(200),l=r(s),u=n(204),c=r(u),d=n(205),p=r(d),f=n(209),h=r(f),m=n(210),g=r(m),v=n(96),y=r(v),b=n(218),x=r(b),w=n(226),k=r(w);n(227),n(228);var _=function(e){function t(e){(0,c["default"])(this,t);var n=(0,h["default"])(this,(t.__proto__||(0,l["default"])(t)).call(this,e));return n.state={code:e.code,assertion:e.assertion&&n._makeAssertion(e.assertion),result:{}},n}return(0,g["default"])(t,e),(0,p["default"])(t,[{key:"componentWillReceiveProps",value:function(e){this.setState({code:e.code,assertion:e.assertion&&this._makeAssertion(e.assertion)}),this.state.code!==e.code&&this.refs.editor.setValue(e.code)}},{key:"_onChange",value:function(e){this.setState({code:e})}},{key:"_makeAssertion",value:function(e){var t=new Function("assert","source","dom",e),n=function(e,t){if(!e)throw console.error(t),new Error(t)};return function(e){t(n,e,o(e))}}},{key:"_verify",value:function(){var e=this.refs.editor.getValue();if(e){try{this.state.assertion(e)}catch(t){return void this.setState({result:{error:t.message}})}this.setState({result:{success:!0}})}else this.setState({result:{error:"Cannot validate empty input."}})}},{key:"render",value:function(){var e=this.props,t=e.title,n=e.description;return y["default"].createElement("div",{className:"example"},t?y["default"].createElement("h2",null,this.state.assertion?y["default"].createElement("i",{className:"fa fa-wrench"},y["default"].createElement("i",{className:"accessible_elem"},"Wrench Icon")):null," ",t):null,n?y["default"].createElement(k["default"],{value:n}):null,this.props.code?y["default"].createElement("div",{className:"editorWithPreview"},y["default"].createElement(x["default"],{ref:"editor",mode:"htmlmixed",defaultValue:this.state.code,config:{extraKeys:{Tab:!1,"Shift-Tab":!1}},onChange:this._onChange.bind(this)}),y["default"].createElement("div",{className:"preview","aria-label":"Editor Output",dangerouslySetInnerHTML:{__html:'
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l=Ht(e);if(!s&&0==l&&!t.force&&n.renderedView==n.view&&(null==n.updateLineNumbers||n.updateLineNumbers>=n.viewTo))return!1;var u=Yo();return l>4&&(n.lineDiv.style.display="none"),O(e,n.updateLineNumbers,t.dims),l>4&&(n.lineDiv.style.display=""),n.renderedView=n.view,u&&Yo()!=u&&u.offsetHeight&&u.focus(),Ko(n.cursorDiv),Ko(n.selectionDiv),n.gutters.style.height=n.sizer.style.minHeight=0,s&&(n.lastWrapHeight=t.wrapperHeight,n.lastWrapWidth=t.wrapperWidth,We(e,400)),n.updateLineNumbers=null,!0}function A(e,t){for(var n=t.viewport,r=!0;(r&&e.options.lineWrapping&&t.oldDisplayWidth!=Ge(e)||(n&&null!=n.top&&(n={top:Math.min(e.doc.height+je(e.display)-Ye(e),n.top)}),t.visible=x(e.display,e.doc,n),!(t.visible.from>=e.display.viewFrom&&t.visible.to<=e.display.viewTo)))&&T(e,t);r=!1){N(e);var o=h(e);Oe(e),y(e,o),L(e,o)}t.signal(e,"update",e),e.display.viewFrom==e.display.reportedViewFrom&&e.display.viewTo==e.display.reportedViewTo||(t.signal(e,"viewportChange",e,e.display.viewFrom,e.display.viewTo),e.display.reportedViewFrom=e.display.viewFrom,e.display.reportedViewTo=e.display.viewTo)}function M(e,t){var n=new E(e,t);if(T(e,n)){N(e),A(e,n);var r=h(e);Oe(e),y(e,r),L(e,r),n.finish()}}function L(e,t){e.display.sizer.style.minHeight=t.docHeight+"px",e.display.heightForcer.style.top=t.docHeight+"px",e.display.gutters.style.height=t.docHeight+e.display.barHeight+Ke(e)+"px"}function N(e){for(var t=e.display,n=t.lineDiv.offsetTop,r=0;r.001||l<-.001)&&(to(i.line,o),D(i.line),i.rest))for(var u=0;u-1&&(p=!1),P(e,d,u,n)),p&&(Ko(d.lineNumber),d.lineNumber.appendChild(document.createTextNode(_(e.options,u)))),s=d.node.nextSibling}else{var f=U(e,d,u,n);a.insertBefore(f,s)}u+=d.size}for(;s;)s=r(s)}function P(e,t,n,r){for(var 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Date+e.options.workTime,r=ca(t.mode,He(e,t.frontier)),o=[];t.iter(t.frontier,Math.min(t.first+t.size,e.display.viewTo+500),function(i){if(t.frontier>=e.display.viewFrom){var a=i.styles,s=i.text.length>e.options.maxHighlightLength,l=Pr(e,i,s?ca(t.mode,r):r,!0);i.styles=l.styles;var u=i.styleClasses,c=l.classes;c?i.styleClasses=c:u&&(i.styleClasses=null);for(var d=!a||a.length!=i.styles.length||u!=c&&(!u||!c||u.bgClass!=c.bgClass||u.textClass!=c.textClass),p=0;!d&&pn)return We(e,e.options.workDelay),!0}),o.length&&Lt(e,function(){for(var t=0;ta;--s){if(s<=i.first)return i.first;var l=Qr(i,s-1);if(l.stateAfter&&(!n||s<=i.frontier))return s;var u=Ha(l.text,null,e.options.tabSize);(null==o||r>u)&&(o=s-1,r=u)}return o}function He(e,t,n){var r=e.doc,o=e.display;if(!r.mode.startState)return!0;var i=qe(e,t,n),a=i>r.first&&Qr(r,i-1).stateAfter;return a=a?ca(r.mode,a):da(r.mode),r.iter(i,t,function(n){Fr(e,n.text,a);var 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+var o=ro(r,n),i=r.first+r.size-1;if(o>i)return gt(r.first+r.size-1,Qr(r,i).text.length,!0,1);t<0&&(t=0);for(var a=Qr(r,o);;){var s=yt(e,a,o,t,n),l=vr(a),u=l&&l.find(0,!0);if(!l||!(s.ch>u.from.ch||s.ch==u.from.ch&&s.xRel>0))return s;o=no(a=u.to.line)}}function yt(e,t,n,r,o){function i(r){var o=ht(e,Bi(n,r),"line",t,u);return s=!0,a>o.bottom?o.left-l:ag)return gt(n,f,v,1);for(;;){if(c?f==p||f==hi(t,p,1):f-p<=1){var y=r0&&y1){var w=tt(e,u,y,"right");a<=w.bottom&&a>=w.top&&Math.abs(r-w.right)1?1:0);return k}var _=Math.ceil(d/2),C=p+_;if(c){C=p;for(var E=0;E<_;++E)C=hi(t,C,1)}var S=i(C);S>r?(f=C,g=S,(v=s)&&(g+=1e3),d=_):(p=C,h=S,m=s,d-=_)}}function bt(e){if(null!=e.cachedTextHeight)return e.cachedTextHeight;if(null==Ui){Ui=Vo("pre");for(var t=0;t<49;++t)Ui.appendChild(document.createTextNode("x")),Ui.appendChild(Vo("br"));Ui.appendChild(document.createTextNode("x"))}Go(e.measure,Ui);var n=Ui.offsetHeight/50;return n>3&&(e.cachedTextHeight=n),Ko(e.measure),n||1}function xt(e){if(null!=e.cachedCharWidth)return e.cachedCharWidth;var t=Vo("span","xxxxxxxxxx"),n=Vo("pre",[t]);Go(e.measure,n);var r=t.getBoundingClientRect(),o=(r.right-r.left)/10;return o>2&&(e.cachedCharWidth=o),o||10}function wt(e){e.curOp={cm:e,viewChanged:!1,startHeight:e.doc.height,forceUpdate:!1,updateInput:null,typing:!1,changeObjs:null,cursorActivityHandlers:null,cursorActivityCalled:0,selectionChanged:!1,updateMaxLine:!1,scrollLeft:null,scrollTop:null,scrollToPos:null,focus:!1,id:++Yi},Gi?Gi.ops.push(e.curOp):e.curOp.ownsGroup=Gi={ops:[e.curOp],delayedCallbacks:[]}}function kt(e){var t=e.delayedCallbacks,n=0;do{for(;n=n.viewTo)||n.maxLineChanged&&t.options.lineWrapping,e.update=e.mustUpdate&&new E(t,e.mustUpdate&&{top:e.scrollTop,ensure:e.scrollToPos},e.forceUpdate)}function St(e){e.updatedDisplay=e.mustUpdate&&T(e.cm,e.update)}function Tt(e){var t=e.cm,n=t.display;e.updatedDisplay&&N(t),e.barMeasure=h(t),n.maxLineChanged&&!t.options.lineWrapping&&(e.adjustWidthTo=Qe(t,n.maxLine,n.maxLine.text.length).left+3,t.display.sizerWidth=e.adjustWidthTo,e.barMeasure.scrollWidth=Math.max(n.scroller.clientWidth,n.sizer.offsetLeft+e.adjustWidthTo+Ke(t)+t.display.barWidth),e.maxScrollLeft=Math.max(0,n.sizer.offsetLeft+e.adjustWidthTo-Ge(t))),(e.updatedDisplay||e.selectionChanged)&&(e.preparedSelection=n.input.prepareSelection(e.focus))}function At(e){var t=e.cm;null!=e.adjustWidthTo&&(t.display.sizer.style.minWidth=e.adjustWidthTo+"px",e.maxScrollLeftt)&&(o.updateLineNumbers=t),e.curOp.viewChanged=!0,t>=o.viewTo)Wi&&wr(e.doc,t)o.viewFrom?zt(e):(o.viewFrom+=r,o.viewTo+=r);else if(t<=o.viewFrom&&n>=o.viewTo)zt(e);else if(t<=o.viewFrom){var i=Bt(e,n,n+r,1);i?(o.view=o.view.slice(i.index),o.viewFrom=i.lineN,o.viewTo+=r):zt(e)}else if(n>=o.viewTo){var i=Bt(e,t,t,-1);i?(o.view=o.view.slice(0,i.index),o.viewTo=i.lineN):zt(e)}else{var a=Bt(e,t,t,-1),s=Bt(e,n,n+r,1);a&&s?(o.view=o.view.slice(0,a.index).concat(Pt(e,a.lineN,s.lineN)).concat(o.view.slice(s.index)),o.viewTo+=r):zt(e)}var l=o.externalMeasured;l&&(n=o.lineN&&t=r.viewTo)){var i=r.view[Wt(e,t)];if(null!=i.node){var a=i.changes||(i.changes=[]);Po(a,n)==-1&&a.push(n)}}}function zt(e){e.display.viewFrom=e.display.viewTo=e.doc.first,e.display.view=[],e.display.viewOffset=0}function Wt(e,t){if(t>=e.display.viewTo)return null;if(t-=e.display.viewFrom,t<0)return null;for(var n=e.display.view,r=0;r0){if(i==a.length-1)return null;o=l+a[i].size-t,i++}else o=l-t;t+=o,n+=o}for(;wr(e.doc,n)!=n;){if(i==(r<0?0:a.length-1))return null;n+=r*a[i-(r<0?1:0)].size,i+=r}return{index:i,lineN:n}}function qt(e,t,n){var r=e.display,o=r.view;0==o.length||t>=r.viewTo||n<=r.viewFrom?(r.view=Pt(e,t,n),r.viewFrom=t):(r.viewFrom>t?r.view=Pt(e,t,r.viewFrom).concat(r.view):r.viewFromn&&(r.view=r.view.slice(0,Wt(e,n)))),r.viewTo=n}function Ht(e){for(var t=e.display.view,n=0,r=0;r400}var o=e.display;Da(o.scroller,"mousedown",Nt(e,Yt)),wi&&ki<11?Da(o.scroller,"dblclick",Nt(e,function(t){if(!Ao(e,t)){var n=Gt(e,t);if(n&&!Jt(e,t)&&!Kt(e.display,t)){Ma(t);var r=e.findWordAt(n);xe(e.doc,r.anchor,r.head)}}})):Da(o.scroller,"dblclick",function(t){Ao(e,t)||Ma(t)}),Fi||Da(o.scroller,"contextmenu",function(t){xn(e,t)});var i,a={end:0};Da(o.scroller,"touchstart",function(t){if(!Ao(e,t)&&!n(t)){clearTimeout(i);var r=+new Date;o.activeTouch={start:r,moved:!1,prev:r-a.end<=300?a:null},1==t.touches.length&&(o.activeTouch.left=t.touches[0].pageX,o.activeTouch.top=t.touches[0].pageY)}}),Da(o.scroller,"touchmove",function(){o.activeTouch&&(o.activeTouch.moved=!0)}),Da(o.scroller,"touchend",function(n){var i=o.activeTouch;if(i&&!Kt(o,n)&&null!=i.left&&!i.moved&&new Date-i.start<300){var a,s=e.coordsChar(o.activeTouch,"page");a=!i.prev||r(i,i.prev)?new de(s,s):!i.prev.prev||r(i,i.prev.prev)?e.findWordAt(s):new de(Bi(s.line,0),me(e.doc,Bi(s.line+1,0))),e.setSelection(a.anchor,a.head),e.focus(),Ma(n)}t()}),Da(o.scroller,"touchcancel",t),Da(o.scroller,"scroll",function(){o.scroller.clientHeight&&(on(e,o.scroller.scrollTop),an(e,o.scroller.scrollLeft,!0),Pa(e,"scroll",e))}),Da(o.scroller,"mousewheel",function(t){sn(e,t)}),Da(o.scroller,"DOMMouseScroll",function(t){sn(e,t)}),Da(o.wrapper,"scroll",function(){o.wrapper.scrollTop=o.wrapper.scrollLeft=0}),o.dragFunctions={enter:function(t){Ao(e,t)||Na(t)},over:function(t){Ao(e,t)||(nn(e,t),Na(t))},start:function(t){tn(e,t)},drop:Nt(e,en),leave:function(t){Ao(e,t)||rn(e)}};var s=o.input.getField();Da(s,"keyup",function(t){mn.call(e,t)}),Da(s,"keydown",Nt(e,fn)),Da(s,"keypress",Nt(e,gn)),Da(s,"focus",qo(yn,e)),Da(s,"blur",qo(bn,e))}function jt(t,n,r){var o=r&&r!=e.Init;if(!n!=!o){var i=t.display.dragFunctions,a=n?Da:Oa;a(t.display.scroller,"dragstart",i.start),a(t.display.scroller,"dragenter",i.enter),a(t.display.scroller,"dragover",i.over),a(t.display.scroller,"dragleave",i.leave),a(t.display.scroller,"drop",i.drop)}}function Vt(e){var t=e.display;t.lastWrapHeight==t.wrapper.clientHeight&&t.lastWrapWidth==t.wrapper.clientWidth||(t.cachedCharWidth=t.cachedTextHeight=t.cachedPaddingH=null,t.scrollbarsClipped=!1,e.setSize())}function Kt(e,t){for(var n=_o(t);n!=e.wrapper;n=n.parentNode)if(!n||1==n.nodeType&&"true"==n.getAttribute("cm-ignore-events")||n.parentNode==e.sizer&&n!=e.mover)return!0}function Gt(e,t,n,r){var o=e.display;if(!n&&"true"==_o(t).getAttribute("cm-not-content"))return null;var i,a,s=o.lineSpace.getBoundingClientRect();try{i=t.clientX-s.left,a=t.clientY-s.top}catch(t){return null}var l,u=vt(e,i,a);if(r&&1==u.xRel&&(l=Qr(e.doc,u.line).text).length==u.ch){var c=Ha(l,l.length,e.options.tabSize)-l.length;u=Bi(u.line,Math.max(0,Math.round((i-Ve(e.display).left)/xt(e.display))-c))}return u}function Yt(e){var t=this,n=t.display;if(!(Ao(t,e)||n.activeTouch&&n.input.supportsTouch())){if(n.shift=e.shiftKey,Kt(n,e))return void(_i||(n.scroller.draggable=!1,setTimeout(function(){n.scroller.draggable=!0},100)));if(!Jt(t,e)){var r=Gt(t,e);switch(window.focus(),Co(e)){case 1:t.state.selectingText?t.state.selectingText(e):r?$t(t,e,r):_o(e)==n.scroller&&Ma(e);break;case 2:_i&&(t.state.lastMiddleDown=+new Date),r&&xe(t.doc,r),setTimeout(function(){n.input.focus()},20),Ma(e);break;case 3:Fi?xn(t,e):vn(t)}}}}function $t(e,t,n){wi?setTimeout(qo(Z,e),0):e.curOp.focus=Yo();var r,o=+new Date;Vi&&Vi.time>o-400&&0==qi(Vi.pos,n)?r="triple":ji&&ji.time>o-400&&0==qi(ji.pos,n)?(r="double",Vi={time:o,pos:n}):(r="single",ji={time:o,pos:n});var i,a=e.doc.sel,s=Di?t.metaKey:t.ctrlKey;e.options.dragDrop&&ns&&!e.isReadOnly()&&"single"==r&&(i=a.contains(n))>-1&&(qi((i=a.ranges[i]).from(),n)<0||n.xRel>0)&&(qi(i.to(),n)>0||n.xRel<0)?Zt(e,t,n,s):Xt(e,t,n,r,s)}function Zt(e,t,n,r){var o=e.display,i=+new Date,a=Nt(e,function(s){_i&&(o.scroller.draggable=!1),e.state.draggingText=!1,Oa(document,"mouseup",a),Oa(o.scroller,"drop",a),Math.abs(t.clientX-s.clientX)+Math.abs(t.clientY-s.clientY)<10&&(Ma(s),!r&&+new Date-200y&&o.push(new de(Bi(h,y),Bi(h,Ua(v,f,i))))}o.length||o.push(new de(n,n)),Se(u,pe(p.ranges.slice(0,d).concat(o),d),{origin:"*mouse",scroll:!1}),e.scrollIntoView(t)}else{var b=c,x=b.anchor,w=t;if("single"!=r){if("double"==r)var k=e.findWordAt(t);else var k=new de(Bi(t.line,0),me(u,Bi(t.line+1,0)));qi(k.anchor,x)>0?(w=k.head,x=$(b.from(),k.anchor)):(w=k.anchor,x=Y(b.to(),k.head))}var o=p.ranges.slice(0);o[d]=new de(me(u,x),w),Se(u,pe(o,d),Ba)}}function a(t){var n=++y,o=Gt(e,t,!0,"rect"==r);if(o)if(0!=qi(o,g)){e.curOp.focus=Yo(),i(o);var s=x(l,u);(o.line>=s.to||o.linev.bottom?20:0;c&&setTimeout(Nt(e,function(){y==n&&(l.scroller.scrollTop+=c,a(t))}),50)}}function s(t){e.state.selectingText=!1,y=1/0,Ma(t),l.input.focus(),Oa(document,"mousemove",b),Oa(document,"mouseup",w),u.history.lastSelOrigin=null}var l=e.display,u=e.doc;Ma(t);var c,d,p=u.sel,f=p.ranges;if(o&&!t.shiftKey?(d=u.sel.contains(n),c=d>-1?f[d]:new de(n,n)):(c=u.sel.primary(),d=u.sel.primIndex),Ii?t.shiftKey&&t.metaKey:t.altKey)r="rect",o||(c=new de(n,n)),n=Gt(e,t,!0,!0),d=-1;else if("double"==r){var h=e.findWordAt(n);c=e.display.shift||u.extend?be(u,c,h.anchor,h.head):h}else if("triple"==r){var m=new de(Bi(n.line,0),me(u,Bi(n.line+1,0)));c=e.display.shift||u.extend?be(u,c,m.anchor,m.head):m}else c=be(u,c,n);o?d==-1?(d=f.length,Se(u,pe(f.concat([c]),d),{scroll:!1,origin:"*mouse"})):f.length>1&&f[d].empty()&&"single"==r&&!t.shiftKey?(Se(u,pe(f.slice(0,d).concat(f.slice(d+1)),0),{scroll:!1,origin:"*mouse"}),p=u.sel):ke(u,d,c,Ba):(d=0,Se(u,new ce([c],0),Ba),p=u.sel);var g=n,v=l.wrapper.getBoundingClientRect(),y=0,b=Nt(e,function(e){Co(e)?a(e):s(e)}),w=Nt(e,s);e.state.selectingText=w,Da(document,"mousemove",b),Da(document,"mouseup",w)}function Qt(e,t,n,r){try{var o=t.clientX,i=t.clientY}catch(t){return!1}if(o>=Math.floor(e.display.gutters.getBoundingClientRect().right))return!1;r&&Ma(t);var a=e.display,s=a.lineDiv.getBoundingClientRect();if(i>s.bottom||!Lo(e,n))return ko(t);i-=s.top-a.viewOffset;for(var l=0;l=o){var c=ro(e.doc,i),d=e.options.gutters[l];return Pa(e,n,e,c,d,t),ko(t)}}}function Jt(e,t){return Qt(e,t,"gutterClick",!0)}function en(e){var t=this;if(rn(t),!Ao(t,e)&&!Kt(t.display,e)){Ma(e),wi&&($i=+new Date);var n=Gt(t,e,!0),r=e.dataTransfer.files;if(n&&!t.isReadOnly())if(r&&r.length&&window.FileReader&&window.File)for(var o=r.length,i=Array(o),a=0,s=function(e,r){if(!t.options.allowDropFileTypes||Po(t.options.allowDropFileTypes,e.type)!=-1){var s=new FileReader;s.onload=Nt(t,function(){var e=s.result;if(/[\x00-\x08\x0e-\x1f]{2}/.test(e)&&(e=""),i[r]=e,++a==o){n=me(t.doc,n);var l={from:n,to:n,text:t.doc.splitLines(i.join(t.doc.lineSeparator())),origin:"paste"};Tn(t.doc,l),Ee(t.doc,fe(n,ta(l)))}}),s.readAsText(e)}},l=0;l-1)return t.state.draggingText(e),void setTimeout(function(){t.display.input.focus()},20);try{var i=e.dataTransfer.getData("Text");if(i){if(t.state.draggingText&&!t.state.draggingText.copy)var u=t.listSelections();if(Te(t.doc,fe(n,n)),u)for(var l=0;la.clientWidth,l=a.scrollHeight>a.clientHeight;if(r&&s||o&&l){if(o&&Di&&_i)e:for(var u=t.target,c=i.view;u!=a;u=u.parentNode)for(var d=0;d=0;--o)An(e,{from:r[o].from,to:r[o].to,text:o?[""]:t.text});else An(e,t)}}function An(e,t){if(1!=t.text.length||""!=t.text[0]||0!=qi(t.from,t.to)){var n=_n(e,t);co(e,t,n,e.cm?e.cm.curOp.id:NaN),Nn(e,t,n,ar(e,t));var r=[];Zr(e,function(e,n){n||Po(r,e.history)!=-1||(wo(e.history,t),r.push(e.history)),Nn(e,t,null,ar(e,t))})}}function Mn(e,t,n){if(!e.cm||!e.cm.state.suppressEdits||n){for(var r,o=e.history,i=e.sel,a="undo"==t?o.done:o.undone,s="undo"==t?o.undone:o.done,l=0;l=0;--l){var d=r.changes[l];if(d.origin=t,c&&!Sn(e,d,!1))return void(a.length=0);u.push(so(e,d));var p=l?_n(e,d):Oo(a);Nn(e,d,p,lr(e,d)),!l&&e.cm&&e.cm.scrollIntoView({from:d.from,to:ta(d)});var f=[];Zr(e,function(e,t){t||Po(f,e.history)!=-1||(wo(e.history,d),f.push(e.history)),Nn(e,d,null,lr(e,d))})}}}}function Ln(e,t){if(0!=t&&(e.first+=t,e.sel=new ce(Ro(e.sel.ranges,function(e){return new de(Bi(e.anchor.line+t,e.anchor.ch),Bi(e.head.line+t,e.head.ch))}),e.sel.primIndex),e.cm)){Rt(e.cm,e.first,e.first-t,t);for(var n=e.cm.display,r=n.viewFrom;re.lastLine())){if(t.from.linei&&(t={from:t.from,to:Bi(i,Qr(e,i).text.length),text:[t.text[0]],origin:t.origin}),t.removed=Jr(e,t.from,t.to),n||(n=_n(e,t)),e.cm?Dn(e.cm,t,r):Gr(e,t,r),Te(e,n,Wa)}}function Dn(e,t,n){var r=e.doc,o=e.display,a=t.from,s=t.to,l=!1,u=a.line;e.options.lineWrapping||(u=no(br(Qr(r,a.line))),r.iter(u,s.line+1,function(e){if(e==o.maxLine)return l=!0,!0})),r.sel.contains(t.from,t.to)>-1&&Mo(e),Gr(r,t,n,i(e)),e.options.lineWrapping||(r.iter(u,a.line+t.text.length,function(e){var t=d(e);t>o.maxLineLength&&(o.maxLine=e,o.maxLineLength=t,o.maxLineChanged=!0,l=!1)}),l&&(e.curOp.updateMaxLine=!0)),r.frontier=Math.min(r.frontier,a.line),We(e,400);var c=t.text.length-(s.line-a.line)-1;t.full?Rt(e):a.line!=s.line||1!=t.text.length||Kr(e.doc,t)?Rt(e,a.line,s.line+1,c):Ft(e,a.line,"text");var p=Lo(e,"changes"),f=Lo(e,"change");if(f||p){var h={from:a,to:s,text:t.text,removed:t.removed,origin:t.origin};f&&So(e,"change",e,h),p&&(e.curOp.changeObjs||(e.curOp.changeObjs=[])).push(h)}e.display.selForContextMenu=null}function In(e,t,n,r,o){if(r||(r=n),qi(r,n)<0){var i=r;r=n,n=i}"string"==typeof t&&(t=e.splitLines(t)),Tn(e,{from:n,to:r,text:t,origin:o})}function On(e,t){if(!Ao(e,"scrollCursorIntoView")){var n=e.display,r=n.sizer.getBoundingClientRect(),o=null;if(t.top+r.top<0?o=!0:t.bottom+r.top>(window.innerHeight||document.documentElement.clientHeight)&&(o=!1),null!=o&&!Mi){var i=Vo("div","",null,"position: absolute; top: "+(t.top-n.viewOffset-Ue(e.display))+"px; height: "+(t.bottom-t.top+Ke(e)+n.barHeight)+"px; left: "+t.left+"px; width: 2px;");e.display.lineSpace.appendChild(i),i.scrollIntoView(o),e.display.lineSpace.removeChild(i)}}}function Pn(e,t,n,r){null==r&&(r=0);for(var o=0;o<5;o++){var i=!1,a=ht(e,t),s=n&&n!=t?ht(e,n):a,l=Fn(e,Math.min(a.left,s.left),Math.min(a.top,s.top)-r,Math.max(a.left,s.left),Math.max(a.bottom,s.bottom)+r),u=e.doc.scrollTop,c=e.doc.scrollLeft;if(null!=l.scrollTop&&(on(e,l.scrollTop),Math.abs(e.doc.scrollTop-u)>1&&(i=!0)),null!=l.scrollLeft&&(an(e,l.scrollLeft),Math.abs(e.doc.scrollLeft-c)>1&&(i=!0)),!i)break}return a}function Rn(e,t,n,r,o){var i=Fn(e,t,n,r,o);null!=i.scrollTop&&on(e,i.scrollTop),null!=i.scrollLeft&&an(e,i.scrollLeft)}function Fn(e,t,n,r,o){var i=e.display,a=bt(e.display);n<0&&(n=0);var s=e.curOp&&null!=e.curOp.scrollTop?e.curOp.scrollTop:i.scroller.scrollTop,l=Ye(e),u={};o-n>l&&(o=n+l);var c=e.doc.height+je(i),d=nc-a;if(ns+l){var f=Math.min(n,(p?c:o)-l);f!=s&&(u.scrollTop=f)}var h=e.curOp&&null!=e.curOp.scrollLeft?e.curOp.scrollLeft:i.scroller.scrollLeft,m=Ge(e)-(e.options.fixedGutter?i.gutters.offsetWidth:0),g=r-t>m;return g&&(r=t+m),t<10?u.scrollLeft=0:tm+h-3&&(u.scrollLeft=r+(g?0:10)-m),u}function zn(e,t,n){null==t&&null==n||Bn(e),null!=t&&(e.curOp.scrollLeft=(null==e.curOp.scrollLeft?e.doc.scrollLeft:e.curOp.scrollLeft)+t),null!=n&&(e.curOp.scrollTop=(null==e.curOp.scrollTop?e.doc.scrollTop:e.curOp.scrollTop)+n)}function Wn(e){Bn(e);var t=e.getCursor(),n=t,r=t;e.options.lineWrapping||(n=t.ch?Bi(t.line,t.ch-1):t,r=Bi(t.line,t.ch+1)),e.curOp.scrollToPos={from:n,to:r,margin:e.options.cursorScrollMargin,isCursor:!0}}function Bn(e){var t=e.curOp.scrollToPos;if(t){e.curOp.scrollToPos=null;var n=mt(e,t.from),r=mt(e,t.to),o=Fn(e,Math.min(n.left,r.left),Math.min(n.top,r.top)-t.margin,Math.max(n.right,r.right),Math.max(n.bottom,r.bottom)+t.margin);e.scrollTo(o.scrollLeft,o.scrollTop)}}function qn(e,t,n,r){var o,i=e.doc;null==n&&(n="add"),"smart"==n&&(i.mode.indent?o=He(e,t):n="prev");var a=e.options.tabSize,s=Qr(i,t),l=Ha(s.text,null,a);s.stateAfter&&(s.stateAfter=null);var 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n=li(e,t.line),r=Qr(e.doc,n.line),o=io(r);if(!o||0==o[0].level){var i=Math.max(0,r.text.search(/\S/)),a=t.line==n.line&&t.ch<=i&&t.ch;return Bi(n.line,a?0:i)}return n}function di(e,t,n){var r=e[0].level;return t==r||n!=r&&tt)return r;if(o.from==t||o.to==t){if(null!=n)return di(e,o.level,e[n].level)?(o.from!=o.to&&(ls=n),r):(o.from!=o.to&&(ls=r),n);n=r}}return n}function fi(e,t,n,r){if(!r)return t+n;do t+=n;while(t>0&&jo(e.text.charAt(t)));return t}function hi(e,t,n,r){var o=io(e);if(!o)return mi(e,t,n,r);for(var i=pi(o,t),a=o[i],s=fi(e,t,a.level%2?-n:n,r);;){if(s>a.from&&s0==a.level%2?a.to:a.from);if(a=o[i+=n],!a)return null;s=n>0==a.level%2?fi(e,a.to,-1,r):fi(e,a.from,1,r)}}function mi(e,t,n,r){var o=t+n;if(r)for(;o>0&&jo(e.text.charAt(o));)o+=n;return o<0||o>e.text.length?null:o}var gi=navigator.userAgent,vi=navigator.platform,yi=/gecko\/\d/i.test(gi),bi=/MSIE \d/.test(gi),xi=/Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(gi),wi=bi||xi,ki=wi&&(bi?document.documentMode||6:xi[1]),_i=/WebKit\//.test(gi),Ci=_i&&/Qt\/\d+\.\d+/.test(gi),Ei=/Chrome\//.test(gi),Si=/Opera\//.test(gi),Ti=/Apple Computer/.test(navigator.vendor),Ai=/Mac OS X 1\d\D([8-9]|\d\d)\D/.test(gi),Mi=/PhantomJS/.test(gi),Li=/AppleWebKit/.test(gi)&&/Mobile\/\w+/.test(gi),Ni=Li||/Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(gi),Di=Li||/Mac/.test(vi),Ii=/\bCrOS\b/.test(gi),Oi=/win/i.test(vi),Pi=Si&&gi.match(/Version\/(\d*\.\d*)/);Pi&&(Pi=Number(Pi[1])),Pi&&Pi>=15&&(Si=!1,_i=!0);var Ri=Di&&(Ci||Si&&(null==Pi||Pi<12.11)),Fi=yi||wi&&ki>=9,zi=!1,Wi=!1;m.prototype=Bo({update:function(e){var t=e.scrollWidth>e.clientWidth+1,n=e.scrollHeight>e.clientHeight+1,r=e.nativeBarWidth;if(n){this.vert.style.display="block",this.vert.style.bottom=t?r+"px":"0";var o=e.viewHeight-(t?r:0);this.vert.firstChild.style.height=Math.max(0,e.scrollHeight-e.clientHeight+o)+"px"}else this.vert.style.display="",this.vert.firstChild.style.height="0";if(t){this.horiz.style.display="block",this.horiz.style.right=n?r+"px":"0",this.horiz.style.left=e.barLeft+"px";var i=e.viewWidth-e.barLeft-(n?r:0);this.horiz.firstChild.style.width=e.scrollWidth-e.clientWidth+i+"px"}else this.horiz.style.display="",this.horiz.firstChild.style.width="0";return!this.checkedZeroWidth&&e.clientHeight>0&&(0==r&&this.zeroWidthHack(),this.checkedZeroWidth=!0),{right:n?r:0,bottom:t?r:0}},setScrollLeft:function(e){this.horiz.scrollLeft!=e&&(this.horiz.scrollLeft=e),this.disableHoriz&&this.enableZeroWidthBar(this.horiz,this.disableHoriz)},setScrollTop:function(e){this.vert.scrollTop!=e&&(this.vert.scrollTop=e),this.disableVert&&this.enableZeroWidthBar(this.vert,this.disableVert)},zeroWidthHack:function(){var e=Di&&!Ai?"12px":"18px";this.horiz.style.height=this.vert.style.width=e,this.horiz.style.pointerEvents=this.vert.style.pointerEvents="none",this.disableHoriz=new Do,this.disableVert=new Do},enableZeroWidthBar:function(e,t){function n(){var r=e.getBoundingClientRect(),o=document.elementFromPoint(r.left+1,r.bottom-1);o!=e?e.style.pointerEvents="none":t.set(1e3,n)}e.style.pointerEvents="auto",t.set(1e3,n)},clear:function(){var e=this.horiz.parentNode;e.removeChild(this.horiz),e.removeChild(this.vert)}},m.prototype),g.prototype=Bo({update:function(){return{bottom:0,right:0}},setScrollLeft:function(){},setScrollTop:function(){},clear:function(){}},g.prototype),e.scrollbarModel={"native":m,"null":g},E.prototype.signal=function(e,t){Lo(e,t)&&this.events.push(arguments)},E.prototype.finish=function(){for(var e=0;e=9&&n.hasSelection&&(n.hasSelection=null),n.poll()}),Da(i,"paste",function(e){Ao(r,e)||Q(e,r)||(r.state.pasteIncoming=!0,n.fastPoll())}),Da(i,"cut",t),Da(i,"copy",t),Da(e.scroller,"paste",function(t){Kt(e,t)||Ao(r,t)||(r.state.pasteIncoming=!0,n.focus())}),Da(e.lineSpace,"selectstart",function(t){Kt(e,t)||Ma(t)}),Da(i,"compositionstart",function(){var e=r.getCursor("from");n.composing&&n.composing.range.clear(),n.composing={start:e,range:r.markText(e,r.getCursor("to"),{className:"CodeMirror-composing"})}}),Da(i,"compositionend",function(){n.composing&&(n.poll(),n.composing.range.clear(),n.composing=null)})},prepareSelection:function(){var e=this.cm,t=e.display,n=e.doc,r=Pe(e);if(e.options.moveInputWithCursor){var o=ht(e,n.sel.primary().head,"div"),i=t.wrapper.getBoundingClientRect(),a=t.lineDiv.getBoundingClientRect();r.teTop=Math.max(0,Math.min(t.wrapper.clientHeight-10,o.top+a.top-i.top)),r.teLeft=Math.max(0,Math.min(t.wrapper.clientWidth-10,o.left+a.left-i.left))}return r},showSelection:function(e){var t=this.cm,n=t.display;Go(n.cursorDiv,e.cursors),Go(n.selectionDiv,e.selection),null!=e.teTop&&(this.wrapper.style.top=e.teTop+"px",this.wrapper.style.left=e.teLeft+"px")},reset:function(e){if(!this.contextMenuPending){var t,n,r=this.cm,o=r.doc;if(r.somethingSelected()){this.prevInput="";var i=o.sel.primary();t=is&&(i.to().line-i.from().line>100||(n=r.getSelection()).length>1e3);var a=t?"-":n||r.getSelection();this.textarea.value=a,r.state.focused&&Va(this.textarea),wi&&ki>=9&&(this.hasSelection=a)}else e||(this.prevInput=this.textarea.value="",wi&&ki>=9&&(this.hasSelection=null));this.inaccurateSelection=t}},getField:function(){return this.textarea},supportsTouch:function(){return!1},focus:function(){if("nocursor"!=this.cm.options.readOnly&&(!Ni||Yo()!=this.textarea))try{this.textarea.focus()}catch(e){}},blur:function(){this.textarea.blur()},resetPosition:function(){this.wrapper.style.top=this.wrapper.style.left=0},receivedFocus:function(){this.slowPoll()},slowPoll:function(){var e=this;e.pollingFast||e.polling.set(this.cm.options.pollInterval,function(){e.poll(),e.cm.state.focused&&e.slowPoll()})},fastPoll:function(){function e(){var r=n.poll();r||t?(n.pollingFast=!1,n.slowPoll()):(t=!0,n.polling.set(60,e))}var t=!1,n=this;n.pollingFast=!0,n.polling.set(20,e)},poll:function(){var e=this.cm,t=this.textarea,n=this.prevInput;if(this.contextMenuPending||!e.state.focused||os(t)&&!n&&!this.composing||e.isReadOnly()||e.options.disableInput||e.state.keySeq)return!1;var r=t.value;
+if(r==n&&!e.somethingSelected())return!1;if(wi&&ki>=9&&this.hasSelection===r||Di&&/[\uf700-\uf7ff]/.test(r))return e.display.input.reset(),!1;if(e.doc.sel==e.display.selForContextMenu){var o=r.charCodeAt(0);if(8203!=o||n||(n=""),8666==o)return this.reset(),this.cm.execCommand("undo")}for(var i=0,a=Math.min(n.length,r.length);i1e3||r.indexOf("\n")>-1?t.value=s.prevInput="":s.prevInput=r,s.composing&&(s.composing.range.clear(),s.composing.range=e.markText(s.composing.start,e.getCursor("to"),{className:"CodeMirror-composing"}))}),!0},ensurePolled:function(){this.pollingFast&&this.poll()&&(this.pollingFast=!1)},onKeyPress:function(){wi&&ki>=9&&(this.hasSelection=null),this.fastPoll()},onContextMenu:function(e){function t(){if(null!=a.selectionStart){var e=o.somethingSelected(),t=""+(e?a.value:"");a.value="⇚",a.value=t,r.prevInput=e?"":"",a.selectionStart=1,a.selectionEnd=t.length,i.selForContextMenu=o.doc.sel}}function n(){if(r.contextMenuPending=!1,r.wrapper.style.cssText=d,a.style.cssText=c,wi&&ki<9&&i.scrollbars.setScrollTop(i.scroller.scrollTop=l),null!=a.selectionStart){(!wi||wi&&ki<9)&&t();var e=0,n=function(){i.selForContextMenu==o.doc.sel&&0==a.selectionStart&&a.selectionEnd>0&&""==r.prevInput?Nt(o,pa.selectAll)(o):e++<10?i.detectingSelectAll=setTimeout(n,500):i.input.reset()};i.detectingSelectAll=setTimeout(n,200)}}var r=this,o=r.cm,i=o.display,a=r.textarea,s=Gt(o,e),l=i.scroller.scrollTop;if(s&&!Si){var u=o.options.resetSelectionOnContextMenu;u&&o.doc.sel.contains(s)==-1&&Nt(o,Se)(o.doc,fe(s),Wa);var c=a.style.cssText,d=r.wrapper.style.cssText;r.wrapper.style.cssText="position: absolute";var p=r.wrapper.getBoundingClientRect();if(a.style.cssText="position: absolute; width: 30px; height: 30px; top: "+(e.clientY-p.top-5)+"px; left: "+(e.clientX-p.left-5)+"px; z-index: 1000; background: "+(wi?"rgba(255, 255, 255, .05)":"transparent")+"; outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);",_i)var f=window.scrollY;if(i.input.focus(),_i&&window.scrollTo(null,f),i.input.reset(),o.somethingSelected()||(a.value=r.prevInput=" "),r.contextMenuPending=!0,i.selForContextMenu=o.doc.sel,clearTimeout(i.detectingSelectAll),wi&&ki>=9&&t(),Fi){Na(e);var h=function(){Oa(window,"mouseup",h),setTimeout(n,20)};Da(window,"mouseup",h)}else setTimeout(n,50)}},readOnlyChanged:function(e){e||this.reset()},setUneditable:zo,needsContentAttribute:!1},ne.prototype),oe.prototype=Bo({init:function(e){function t(e){if(!Ao(r,e)){if(r.somethingSelected())Hi={lineWise:!1,text:r.getSelections()},"cut"==e.type&&r.replaceSelection("",null,"cut");else{if(!r.options.lineWiseCopyCut)return;var t=ee(r);Hi={lineWise:!0,text:t.text},"cut"==e.type&&r.operation(function(){r.setSelections(t.ranges,0,Wa),r.replaceSelection("",null,"cut")})}if(e.clipboardData){e.clipboardData.clearData();var i=Hi.text.join("\n");if(e.clipboardData.setData("Text",i),e.clipboardData.getData("Text")==i)return void e.preventDefault()}var a=re(),s=a.firstChild;r.display.lineSpace.insertBefore(a,r.display.lineSpace.firstChild),s.value=Hi.text.join("\n");var l=document.activeElement;Va(s),setTimeout(function(){r.display.lineSpace.removeChild(a),l.focus(),l==o&&n.showPrimarySelection()},50)}}var n=this,r=n.cm,o=n.div=e.lineDiv;te(o,r.options.spellcheck),Da(o,"paste",function(e){Ao(r,e)||Q(e,r)||ki<=11&&setTimeout(Nt(r,function(){n.pollContent()||Rt(r)}),20)}),Da(o,"compositionstart",function(e){var t=e.data;if(n.composing={sel:r.doc.sel,data:t,startData:t},t){var o=r.doc.sel.primary(),i=r.getLine(o.head.line),a=i.indexOf(t,Math.max(0,o.head.ch-t.length));a>-1&&a<=o.head.ch&&(n.composing.sel=fe(Bi(o.head.line,a),Bi(o.head.line,a+t.length)))}}),Da(o,"compositionupdate",function(e){n.composing.data=e.data}),Da(o,"compositionend",function(e){var t=n.composing;t&&(e.data==t.startData||/\u200b/.test(e.data)||(t.data=e.data),setTimeout(function(){t.handled||n.applyComposition(t),n.composing==t&&(n.composing=null)},50))}),Da(o,"touchstart",function(){n.forceCompositionEnd()}),Da(o,"input",function(){n.composing||!r.isReadOnly()&&n.pollContent()||Lt(n.cm,function(){Rt(r)})}),Da(o,"copy",t),Da(o,"cut",t)},prepareSelection:function(){var e=Pe(this.cm,!1);return e.focus=this.cm.state.focused,e},showSelection:function(e,t){e&&this.cm.display.view.length&&((e.focus||t)&&this.showPrimarySelection(),this.showMultipleSelections(e))},showPrimarySelection:function(){var e=window.getSelection(),t=this.cm.doc.sel.primary(),n=se(this.cm,e.anchorNode,e.anchorOffset),r=se(this.cm,e.focusNode,e.focusOffset);if(!n||n.bad||!r||r.bad||0!=qi($(n,r),t.from())||0!=qi(Y(n,r),t.to())){var o=ie(this.cm,t.from()),i=ie(this.cm,t.to());if(o||i){var a=this.cm.display.view,s=e.rangeCount&&e.getRangeAt(0);if(o){if(!i){var l=a[a.length-1].measure,u=l.maps?l.maps[l.maps.length-1]:l.map;i={node:u[u.length-1],offset:u[u.length-2]-u[u.length-3]}}}else o={node:a[0].measure.map[2],offset:0};try{var c=Ka(o.node,o.offset,i.offset,i.node)}catch(d){}c&&(!yi&&this.cm.state.focused?(e.collapse(o.node,o.offset),c.collapsed||e.addRange(c)):(e.removeAllRanges(),e.addRange(c)),s&&null==e.anchorNode?e.addRange(s):yi&&this.startGracePeriod()),this.rememberSelection()}}},startGracePeriod:function(){var e=this;clearTimeout(this.gracePeriod),this.gracePeriod=setTimeout(function(){e.gracePeriod=!1,e.selectionChanged()&&e.cm.operation(function(){e.cm.curOp.selectionChanged=!0})},20)},showMultipleSelections:function(e){Go(this.cm.display.cursorDiv,e.cursors),Go(this.cm.display.selectionDiv,e.selection)},rememberSelection:function(){var e=window.getSelection();this.lastAnchorNode=e.anchorNode,this.lastAnchorOffset=e.anchorOffset,this.lastFocusNode=e.focusNode,this.lastFocusOffset=e.focusOffset},selectionInEditor:function(){var e=window.getSelection();if(!e.rangeCount)return!1;var t=e.getRangeAt(0).commonAncestorContainer;return Za(this.div,t)},focus:function(){"nocursor"!=this.cm.options.readOnly&&this.div.focus()},blur:function(){this.div.blur()},getField:function(){return this.div},supportsTouch:function(){return!0},receivedFocus:function(){function e(){t.cm.state.focused&&(t.pollSelection(),t.polling.set(t.cm.options.pollInterval,e))}var t=this;this.selectionInEditor()?this.pollSelection():Lt(this.cm,function(){t.cm.curOp.selectionChanged=!0}),this.polling.set(this.cm.options.pollInterval,e)},selectionChanged:function(){var e=window.getSelection();return e.anchorNode!=this.lastAnchorNode||e.anchorOffset!=this.lastAnchorOffset||e.focusNode!=this.lastFocusNode||e.focusOffset!=this.lastFocusOffset},pollSelection:function(){if(!this.composing&&!this.gracePeriod&&this.selectionChanged()){var e=window.getSelection(),t=this.cm;this.rememberSelection();var n=se(t,e.anchorNode,e.anchorOffset),r=se(t,e.focusNode,e.focusOffset);n&&r&&Lt(t,function(){Se(t.doc,fe(n,r),Wa),(n.bad||r.bad)&&(t.curOp.selectionChanged=!0)})}},pollContent:function(){var e=this.cm,t=e.display,n=e.doc.sel.primary(),r=n.from(),o=n.to();if(r.linet.viewTo-1)return!1;var i;if(r.line==t.viewFrom||0==(i=Wt(e,r.line)))var a=no(t.view[0].line),s=t.view[0].node;else var a=no(t.view[i].line),s=t.view[i-1].node.nextSibling;var l=Wt(e,o.line);if(l==t.view.length-1)var u=t.viewTo-1,c=t.lineDiv.lastChild;else var u=no(t.view[l+1].line)-1,c=t.view[l+1].node.previousSibling;for(var d=e.doc.splitLines(ue(e,s,c,a,u)),p=Jr(e.doc,Bi(a,0),Bi(u,Qr(e.doc,u).text.length));d.length>1&&p.length>1;)if(Oo(d)==Oo(p))d.pop(),p.pop(),u--;else{if(d[0]!=p[0])break;d.shift(),p.shift(),a++}for(var f=0,h=0,m=d[0],g=p[0],v=Math.min(m.length,g.length);f1||d[0]||qi(w,k)?(In(e.doc,d,w,k,"+input"),!0):void 0},ensurePolled:function(){this.forceCompositionEnd()},reset:function(){this.forceCompositionEnd()},forceCompositionEnd:function(){this.composing&&!this.composing.handled&&(this.applyComposition(this.composing),this.composing.handled=!0,this.div.blur(),this.div.focus())},applyComposition:function(e){this.cm.isReadOnly()?Nt(this.cm,Rt)(this.cm):e.data&&e.data!=e.startData&&Nt(this.cm,X)(this.cm,e.data,0,e.sel)},setUneditable:function(e){e.contentEditable="false"},onKeyPress:function(e){e.preventDefault(),this.cm.isReadOnly()||Nt(this.cm,X)(this.cm,String.fromCharCode(null==e.charCode?e.keyCode:e.charCode),0)},readOnlyChanged:function(e){this.div.contentEditable=String("nocursor"!=e)},onContextMenu:zo,resetPosition:zo,needsContentAttribute:!0},oe.prototype),e.inputStyles={textarea:ne,contenteditable:oe},ce.prototype={primary:function(){return this.ranges[this.primIndex]},equals:function(e){if(e==this)return!0;if(e.primIndex!=this.primIndex||e.ranges.length!=this.ranges.length)return!1;for(var t=0;t=0&&qi(e,r.to())<=0)return n}return-1}},de.prototype={from:function(){return $(this.anchor,this.head)},to:function(){return Y(this.anchor,this.head)},empty:function(){return this.head.line==this.anchor.line&&this.head.ch==this.anchor.ch}};var Ui,ji,Vi,Ki={left:0,right:0,top:0,bottom:0},Gi=null,Yi=0,$i=0,Zi=0,Xi=null;wi?Xi=-.53:yi?Xi=15:Ei?Xi=-.7:Ti&&(Xi=-1/3);var Qi=function(e){var t=e.wheelDeltaX,n=e.wheelDeltaY;return null==t&&e.detail&&e.axis==e.HORIZONTAL_AXIS&&(t=e.detail),null==n&&e.detail&&e.axis==e.VERTICAL_AXIS?n=e.detail:null==n&&(n=e.wheelDelta),{x:t,y:n}};e.wheelEventPixels=function(e){var t=Qi(e);return t.x*=Xi,t.y*=Xi,t};var Ji=new Do,ea=null,ta=e.changeEnd=function(e){return e.text?Bi(e.from.line+e.text.length-1,Oo(e.text).length+(1==e.text.length?e.from.ch:0)):e.to};e.prototype={constructor:e,focus:function(){window.focus(),this.display.input.focus()},setOption:function(e,t){var n=this.options,r=n[e];n[e]==t&&"mode"!=e||(n[e]=t,ra.hasOwnProperty(e)&&Nt(this,ra[e])(this,t,r))},getOption:function(e){return this.options[e]},getDoc:function(){return this.doc},addKeyMap:function(e,t){this.state.keyMaps[t?"push":"unshift"](Yn(e))},removeKeyMap:function(e){for(var t=this.state.keyMaps,n=0;nn&&(qn(this,o.head.line,e,!0),n=o.head.line,r==this.doc.sel.primIndex&&Wn(this));else{var i=o.from(),a=o.to(),s=Math.max(n,i.line);n=Math.min(this.lastLine(),a.line-(a.ch?0:1))+1;for(var l=s;l0&&ke(this.doc,r,new de(i,u[r].to()),Wa)}}}),getTokenAt:function(e,t){return Ir(this,e,t)},getLineTokens:function(e,t){return Ir(this,Bi(e),t,!0)},getTokenTypeAt:function(e){e=me(this.doc,e);var t,n=Rr(this,Qr(this.doc,e.line)),r=0,o=(n.length-1)/2,i=e.ch;if(0==i)t=n[2];else for(;;){var a=r+o>>1;if((a?n[2*a-1]:0)>=i)o=a;else{if(!(n[2*a+1]o&&(e=o,r=!0),n=Qr(this.doc,e)}else n=e;return dt(this,n,{top:0,left:0},t||"page").top+(r?this.doc.height-oo(n):0)},defaultTextHeight:function(){return bt(this.display)},defaultCharWidth:function(){return xt(this.display)},setGutterMarker:Dt(function(e,t,n){return Hn(this.doc,e,"gutter",function(e){var r=e.gutterMarkers||(e.gutterMarkers={});return r[t]=n,!n&&Uo(r)&&(e.gutterMarkers=null),!0})}),clearGutter:Dt(function(e){var t=this,n=t.doc,r=n.first;n.iter(function(n){n.gutterMarkers&&n.gutterMarkers[e]&&(n.gutterMarkers[e]=null,Ft(t,r,"gutter"),Uo(n.gutterMarkers)&&(n.gutterMarkers=null)),++r})}),lineInfo:function(e){if("number"==typeof e){if(!ve(this.doc,e))return null;var t=e;if(e=Qr(this.doc,e),!e)return null}else{var t=no(e);if(null==t)return null}return{line:t,handle:e,text:e.text,gutterMarkers:e.gutterMarkers,textClass:e.textClass,bgClass:e.bgClass,wrapClass:e.wrapClass,widgets:e.widgets}},getViewport:function(){return{from:this.display.viewFrom,to:this.display.viewTo}},addWidget:function(e,t,n,r,o){var i=this.display;e=ht(this,me(this.doc,e));var a=e.bottom,s=e.left;if(t.style.position="absolute",t.setAttribute("cm-ignore-events","true"),this.display.input.setUneditable(t),i.sizer.appendChild(t),"over"==r)a=e.top;else if("above"==r||"near"==r){var 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\n \n \n
Note: This date will be recorded.
\n
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Eggs
\n
Milk
\n
Bread
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Sea
\n
Surf
\n
Sun
\n
\n'},{title:"Unsemantic List exercise",description:"Update the example below so that the items are expressed as a list. The easiest way to\nmake this semantic is to use a list tag. If that is not\npossible, wrap the elements in a container and give\nit a role of ```list```. The individual items will need to be identified with a role of ```listitem```.\n",code:"
\n A house of straw\n A house of sticks\n A house of bricks\n
\n",assertion:"assert(\n dom.querySelector('[role=\"list\"]') || dom.querySelector('ul') || dom.querySelector('ol'),\n \"You should create a wrapping element for the list. Either a 'ul', 'li' OR a 'div' with the role 'list'.\"\n);\nassert(\n dom.querySelectorAll('[role=\"listitem\"]').length ==3 || dom.querySelectorAll('li').length == 3,\n \"Wrap the items in an 'li' element or in a 'span' OR 'div' with the role 'listitem'.\"\n);\n"}]}},content:"Semantic lists help screen readers understand the type of the element and the \nnumber of items in the element, and provide\neasier navigation via list commands specific to screen readers.\n\n",pathHash:"98c85cba9fc00ffd3ebfd95b418ce09e",contentConverter:r,layout:o}},function(e,t,n){var r=n(3);r=r?r["default"]||r:r;var o=n(199);o=o?o["default"]||o:o,e.exports={options:{title:"Dialogs",chapter:"Writing Code",style:"#slide {\n position: initial;\n}\n#overlay, #overlay2 {\n display: none;\n position: absolute;\n left: 0px;\n top: 0px;\n width: 100vw;\n height: 100vh;\n text-align:center;\n z-index: 1000;\n background-color: rgba(0, 0, 0, .4);\n align-items: center;\n justify-content: center;\n}\n\n#container, #container2 {\n width:400px;\n background-color: #fff;\n border:1px solid #000;\n padding:15px;\n}\n\nlabel {\n float: left;\n width: 100px;\n clear: both;\n text-align: right;\n margin: 0 10px;\n}\n\n#content, #content2 {\n margin: 20px 0;\n}\n\n#closeButton:focus {\n outline: 2px solid #4A97F9;\n outline-offset: 1px;\n}\n\n#closeImg {\n float: right;\n margin-top: 9px;\n}\n\n#sourceLink, #sourceLink2 {\n margin: 10px;\n}\n\n#content2 > div {\n margin: 10px 0;\n}\n",layout_data:{examples:[{title:"Semantic Dialog",description:"Start VoiceOver if you are on your Mac and press enter on the Show Dialog button. You will notice that:\n1. VoiceOver announces that a dialog is opened and the name of the dialog because\nwe have a `role` of 'dialog' with a label associated using `aria-labelledby`.\n2. When the dialog opens, focus lands in the first focusable element in\nthe dialog.\n3. Tabbing keeps focus within the dialog. Note that you have to write code to restrict the tab sequence to the dialog.\n4. Closing the dialog places focus back on the source button.\n5. Pressing the esc key closes the dialog and places the focus back on the source button. Note that for widgets like\ntypeaheads, pressing esc should close the typeahead and not the dialog.\n\nNote that if you have textual content in the dialog besides labels, you should associate it\nwith an `aria-describedby` to the right input field so it gets announced when you tab to the input field.\n",code:'\n
\n \n
Shipping Address
\n
\n
\n \n \n
\n
\n
\n \n Submit\n \n \n Close\n \n
\n
\n
\n'},{title:"Unsemantic Dialog exercise",description:"The dialog below is unsemantic:\n\n1. The fact that a dialog opened up is not announced to VoiceOver.\n2. The heading that labels the dialog is not announced when the dialog is opened.\n\nTo fix these issues:\n1. Change the `` to a semantic `h2` tag.\n2. To the div with `id` container2, add a `role` of 'dialog'.\n3. To the div with `id` container2, add `aria-labelledby`='dialog-title'.\n\nVerify with VoiceOver.\n",code:'\n Show Dialog\n\n
\n
\n Shipping Address\n
\n
\n
\n \n \n
\n
\n \n Submit\n \n \n Close\n \n
\n
\n
\n
\n
\n',assertion:"var dialog = dom.querySelector('#container2');\nvar title = dom.querySelector('#dialog-title');\nvar heading = dom.querySelector('h2');\nassert(\n dialog.hasAttribute('role') && dialog.getAttribute('role')=== \"dialog\",\n \"It doesn't look like you added a role of 'dialog'.\"\n);\nassert(\n dialog.hasAttribute('aria-labelledby') && dialog.getAttribute('aria-labelledby')=== \"dialog-title\",\n \"It doesn't look like you associated the heading to the dialog with an aria-labelledby.\"\n);\nassert(\n heading && (heading.getAttribute('id') === 'dialog-title'),\n \"It doesn't look like you made the dialog heading semantic.\"\n);\n"}]}},content:"Dialogs are a little bit trickier to make accessible, but with a few key \nprinciples, they can be made keyboard navigable and usable with screen readers.\n",pathHash:"98c85cba9fc00ffd3ebfd95b418ce09e",contentConverter:r,layout:o}},function(e,t,n){var r=n(3);r=r?r["default"]||r:r;var o=n(199);o=o?o["default"]||o:o,e.exports={options:{title:"Tables",chapter:"Writing Code",style:"\n.editorWithPreview > .editor,\n.editorWithPreview > .preview {\n width: 50%;\n max-width: 50%;\n}\n\ntable, th, td {\n border: 1px solid black;\n text-align: center;\n font-size: 1em;\n}\n\nth {\n background-color: #ddd;\n}\n\n.table {\n display: table;\n}\n\n.tableRow {\n display: table-row;\n}\n\n.tableHeading {\n display: table-header-group;\n background-color: #ddd;\n}\n\n.tableCell, .tableHead {\n display: table-cell;\n padding: 3px 10px;\n border: 1px solid #999999;\n}\n\n.tableHeading {\n display: table-header-group;\n background-color: #ddd;\n font-weight: bold;\n}\n\n.tableBody {\n display: table-row-group;\n}\n",layout_data:{examples:[{title:"Semantic Table",description:"The following table uses semantic table markup. HTML provides many elements and attributes to create fully\naccessible tables. Note: ARIA 1.0 does not include HTML table equivalence; that is coming in ARIA 1.1. So\nit is best to stick to native HTML unless you are building an interactive grid that includes two-dimensional\narrow key navigation of the table content. To test the table below with VoiceOver:\n\n1. Press Ctrl + Opt + Cmd + h repeatedly until you reach the Editor Output region.\n2. Now press Ctrl + Opt + Right Arrow repeatedly to navigate the table cells.\n\nAt this time, VoiceOver does not read the column headers in Chrome. However, VoiceOver does read them in Safari. Windows screen readers typically read column and row headers as well.\n",code:"
\n
\n
\n
Week1
\n
Week2
\n
\n
\n
Clicks
\n
100
\n
90
\n
\n
\n
Likes
\n
60
\n
55
\n
\n
\n"},{title:"Unsemantic Table exercise",description:"If the information is tabular, using CSS to create the appearance of a table makes the information\nalmost impossible for a screen reader user to understand and use. Convert the following tabular data\ninto an accessible HTML table.\n",code:'
\n
\n
\n Month\n
\n
\n Mood\n
\n
\n
\n
\n
\n January\n
\n
\n happy\n
\n
\n
\n
\n',assertion:"assert(\n dom.querySelector('table'),\n \"Use a semantic table element.\"\n);\nassert(\n dom.querySelectorAll('tr').length == 2,\n \"Are you using semantic tr tags?\"\n);\nassert(\n dom.querySelectorAll('th').length == 2,\n \"Are you using semantic th tags?\"\n);\nassert(\n dom.querySelectorAll('td').length == 2,\n \"Are you using semantic td tags?\"\n);\n"}]}},content:"Tables help screen readers process information presented in a tabular format.\nWhen information is presented using table markup, screen reader users can\nread down columns and across rows, and even hear column and row headings as they do so.\n\n",pathHash:"98c85cba9fc00ffd3ebfd95b418ce09e",contentConverter:r,layout:o}},function(e,t,n){var r=n(3);r=r?r["default"]||r:r;var o=n(199);o=o?o["default"]||o:o,e.exports={options:{title:"Menus",chapter:"Writing Code",style:'img {\n width: 100px;\n height: 100px;\n}\n\n.popupMenuWidget {\n padding: 1em;\n position: relative;\n}\n\n.popupMenuWidget [role="button"] {\n border: 1px solid black;\n border-radius: 3px;\n display: inline-block;\n padding: 1px 3px;\n position: relative;\n z-index: 2;\n}\n\n.popupMenuWidget [role="button"]:hover,\n.popupMenuWidget [role="button"]:focus {\n text-decoration: none;\n}\n\n.popupMenuWidget [role="menu"] {\n border: 1px solid black;\n display: none;\n position: relative;\n top: -1px;\n z-index: 1;\n list-style: none;\n margin: 0;\n}\n\n.popupMenuWidget [role="menu"] a {\n display: block;\n padding: 0px 5px;\n}\n\n.popupMenuWidget [role="menuitem"]:focus {\n background-color: #428bca;\n color: white;\n}\n',layout_data:{examples:[{title:"Accessible Menu",description:"The example below shows how to apply ARIA attributes to an unordered list\nelement to give it the semantics screen readers need to announce it as a menu.\nIt also demonstrates the JavaScript functionality you need to create the\nappropriate keyboard interaction.\n\n1. You can move focus to the button by pressing tab.\n2. Pressing enter with focus on the button opens the menu and moves focus to the first menu item.\n3. Up and down arrows navigate the menu.\n4. Escape closes the menu, returning focus to the button.\n5. If actions were implemented, pressing enter on a menu item would perform the action.\n",code:'\n\n Actions ▼\n \n
\n Create\n
\n
\n Edit\n
\n
\n Delete\n
\n \n\n'},{title:"Inaccessible Menu exercise",description:'Update the example below to include the necessary markup for making\nthis menu accessible. You should address the following issues.\n\n1. The `a` tag with the ID `menuTrigger` has an associated popup. Therefore, it should be marked up with `aria-haspopup` and `aria-owns` to make this relationship explicit.\n2. The `a` tag with the ID `menuTrigger` should be marked up as a button with the role `button`.\n3. The `a` tag with the ID `menuTrigger` should be tabbable. Add an explicit `tabindex="0"` to it.\n4. The `ul` tag with the ID \'actionsMenu\' should be marked up as a menu with the role `menu`.\n5. The `a` tags inside the div with the ID `actionsMenu` are menu items. Mark them up with the role `menuitem`.\n6. The `a` tags inside the div with the ID `actionsMenu` should not be tabbable. Add an explicit `tabindex="-1"` to each of them.\n',code:'\n\n\n Actions ▼\n \n
\n Create\n
\n
\n Edit\n
\n
\n Delete\n
\n \n\n',assertion:"var menuWidget = dom.querySelector('#popupMenuExampleWithAssertions');\n\n// aria-haspopup\nassert(\n menuWidget.querySelector('#menuTrigger').getAttribute('aria-haspopup') === 'true',\n 'Add the attribute `aria-haspopup=\"true\"` to the element with the ID `menuTrigger`'\n);\n\n// aria-owns\nassert(\n menuWidget.querySelector('#menuTrigger').getAttribute('aria-owns') === 'actionsMenu',\n 'Add the attribute `aria-owns=\"actionsMenu\"` to the element with the ID `menuTrigger`'\n);\n// button role\nassert(\n menuWidget.querySelector('#menuTrigger').getAttribute('role') === 'button',\n 'Add the attribute `role=\"button\"` to the element with the ID `menuTrigger`'\n);\n// button tab index\nassert(\n menuWidget.querySelector('#menuTrigger').getAttribute('tabIndex') === '0',\n 'Add the attribute `tabindex=\"0\"` to the element with the ID `menuTrigger`'\n);\n\n// menu role\nassert(\n menuWidget.querySelector('#actionsMenu').getAttribute('role') === 'menu',\n 'Add the attribute `role=\"menu\"` to the element with the ID `actionsMenu`'\n);\n\n// menu link item roles\nassert(\n [].slice.call(menuWidget.querySelector('#actionsMenu').querySelectorAll('a')).every(function (item) {\n return item.getAttribute('role') === 'menuitem';\n }),\n 'Add the attribute `role=\"menuitem\"` to each of the `a` tag elements in the element with the ID `actionsMenu`'\n);\n\n// menu link items tabindices\nassert(\n [].slice.call(menuWidget.querySelector('#actionsMenu').querySelectorAll('a')).every(function (item) {\n return item.getAttribute('tabIndex') === '-1';\n }),\n 'Add the attribute `tabindex=\"-1\"` to each of the `a` tag elements in the element with the ID `actionsMenu`'\n);\n"}]}},content:"Menus, like dialogs, rely on a few key principles to render them usable with \nthe keyboard or screen reader.\n\n",pathHash:"98c85cba9fc00ffd3ebfd95b418ce09e",contentConverter:r,layout:o}},function(e,t,n){var r=n(3);r=r?r["default"]||r:r;var o=n(199);o=o?o["default"]||o:o,e.exports={options:{title:"ARIA",chapter:"Writing Code",style:".container {\n font-size: 100%\n width: 120px;\n height: 100px;\n border: thin solid gray;\n}\n\n#additionalLinks, #a11yLinkHide {\n display: none;\n}\n",layout_data:{description:"",examples:[{title:"ARIA",description:"For this exercise, we will focus on one small part of WAI-ARIA called landmark regions. landmark regions help screen reader users do what others do when they glance at a page, i.e., see its different parts from a bird's-eye view. They also make it easy to move the screen reader's reading cursor to different locations on the page. Instructions for this exercise are in the comment block in the editor below.",code:'\n
ARIA Landmarks Exercise
\n\nHow many landmarks did you find on the page?\n\n',assertion:"var link = document.getElementById('landmarks');\nassert(\n link.value === '3' || link.value === 'three',\n \"That is not the right number of landmarks on the page!\"\n);\n",note:'\nThere are several types of landmark roles. Some of them are:\n\n- ``,`
` -- Equivalent to “directing the gaze” of \nthe screen reader user. Should contain only the primary content of the \npage.\n\n- `