Changes from ticket patch.

src/js/media/views/uploader/inline.js

@@ -115,6 +115,7 @@ UploaderInline = View.extend(/** @lends wp.media.view.UploaderInline.prototype *
 
 			$browser.detach().text( $placeholder.text() );
 			$browser[0].className = $placeholder[0].className;
+			$browser[0].setAttribute( 'aria-labelledby', $browser[0].id + ' ' + $placeholder[0].getAttribute('aria-labelledby') );
 			$placeholder.replaceWith( $browser.show() );
 		}
 

src/js/media/views/uploader/status.js

@@ -111,13 +111,14 @@ UploaderStatus = View.extend(/** @lends wp.media.view.UploaderStatus.prototype *
 	 * @param {Backbone.Model} error
 	 */
 	error: function( error ) {
+		console.log('error!');
 		var statusError = new wp.media.view.UploaderStatusError( {
 			filename: this.filename( error.get( 'file' ).name ),
 			message:  error.get( 'message' )
 		} );
 
 		// Can show additional info here while retrying to create image sub-sizes.
-		this.views.add( '.upload-errors', statusError, { at: 0 } );
+		this.$el.attr( 'tabindex', '-1' ).focus() };
 	},
 
 	dismiss: function() {

src/wp-includes/functions.php

@@ -7781,3 +7781,123 @@ function is_php_version_compatible( $required ) {
 function wp_fuzzy_number_match( $expected, $actual, $precision = 1 ) {
 	return abs( (float) $expected - (float) $actual ) <= $precision;
 }
+
+/**
+ * Sanitizes an attributes array into an attributes string to be placed inside a `<script>` tag.
+ *
+ * Automatically injects type attribute if needed.
+ * Used by {@see wp_get_script_tag()} and {@see wp_get_inline_script_tag()}.
+ *
+ * @since 5.6.0
+ *
+ * @param array $attributes Key-value pairs representing `<script>` tag attributes.
+ * @return string String made of sanitized `<script>` tag attributes.
+ */
+function wp_sanitize_script_attributes( $attributes ) {
+	$html5_script_support = ! is_admin() && ! current_theme_supports( 'html5', 'script' );
+	$attributes_string    = '';
+
+	// If HTML5 scirpt tag is supported, only the attribute name is added
+	// to $attributes_string for entries with a boolean value, and that are true.
+	foreach ( $attributes as $attribute_name => $attribute_value ) {
+		if ( is_bool( $attribute_value ) ) {
+			if ( $attribute_value ) {
+				$attributes_string .= $html5_script_support ? sprintf( ' %1$s="%2$s"', $attribute_name, esc_attr( $attribute_name ) ) : ' ' . $attribute_name;
+			}
+		} else {
+			$attributes_string .= sprintf( ' %1$s="%2$s"', $attribute_name, esc_attr( $attribute_value ) );
+		}
+	}
+
+	return $attributes_string;
+}
+
+/**
+ * Formats `<script>` loader tags.
+ *
+ * It is possible to inject attributes in the `<script>` tag via the {@see 'wp_script_attributes'} filter.
+ * Automatically injects type attribute if needed.
+ *
+ * @since 5.6.0
+ *
+ * @param array $attributes Key-value pairs representing `<script>` tag attributes.
+ * @return string String containing `<script>` opening and closing tags.
+ */
+function wp_get_script_tag( $attributes ) {
+	if ( ! isset( $attributes['type'] ) && ! is_admin() && ! current_theme_supports( 'html5', 'script' ) ) {
+		$attributes['type'] = 'text/javascript';
+	}
+	/**
+	 * Filters attributes to be added to a script tag.
+	 *
+	 * @since 5.6.0
+	 *
+	 * @param array $attributes Key-value pairs representing `<script>` tag attributes.
+	 *                          Only the attribute name is added to the `<script>` tag for
+	 *                          entries with a boolean value, and that are true.
+	 */
+	$attributes = apply_filters( 'wp_script_attributes', $attributes );
+
+	return sprintf( "<script%s></script>\n", wp_sanitize_script_attributes( $attributes ) );
+}
+
+/**
+ * Prints formatted `<script>` loader tag.
+ *
+ * It is possible to inject attributes in the `<script>` tag via the  {@see 'wp_script_attributes'}  filter.
+ * Automatically injects type attribute if needed.
+ *
+ * @since 5.6.0
+ *
+ * @param array $attributes Key-value pairs representing `<script>` tag attributes.
+ */
+function wp_print_script_tag( $attributes ) {
+	echo wp_get_script_tag( $attributes );
+}
+
+/**
+ * Wraps inline JavaScript in `<script>` tag.
+ *
+ * It is possible to inject attributes in the `<script>` tag via the  {@see 'wp_script_attributes'}  filter.
+ * Automatically injects type attribute if needed.
+ *
+ * @since 5.6.0
+ *
+ * @param string $javascript Inline JavaScript code.
+ * @param array  $attributes Optional. Key-value pairs representing `<script>` tag attributes.
+ * @return string String containing inline JavaScript code wrapped around `<script>` tag.
+ */
+function wp_get_inline_script_tag( $javascript, $attributes = array() ) {
+	if ( ! isset( $attributes['type'] ) && ! is_admin() && ! current_theme_supports( 'html5', 'script' ) ) {
+		$attributes['type'] = 'text/javascript';
+	}
+	/**
+	 * Filters attributes to be added to a script tag.
+	 *
+	 * @since 5.6.0
+	 *
+	 * @param array $attributes Key-value pairs representing `<script>` tag attributes.
+	 *                          Only the attribute name is added to the `<script>` tag for
+	 *                          entries with a boolean value, and that are true.
+	 */
+	$attributes = apply_filters( 'wp_script_attributes', $attributes );
+
+	$javascript = "\n" . trim( $javascript, "\n\r " ) . "\n";
+
+	return sprintf( "<script%s>%s</script>\n", wp_sanitize_script_attributes( $attributes ), $javascript );
+}
+
+/**
+ * Prints inline JavaScript wrapped in `<script>` tag.
+ *
+ * It is possible to inject attributes in the `<script>` tag via the  {@see 'wp_script_attributes'}  filter.
+ * Automatically injects type attribute if needed.
+ *
+ * @since 5.6.0
+ *
+ * @param string $javascript Inline JavaScript code.
+ * @param array  $attributes Optional. Key-value pairs representing `<script>` tag attributes.
+ */
+function wp_print_inline_script_tag( $javascript, $attributes = array() ) {
+	echo wp_get_inline_script_tag( $javascript, $attributes );
+}

src/wp-includes/media-template.php

@@ -252,12 +252,12 @@ function wp_print_media_templates() {
 			<div class="upload-ui">
 				<h2 class="upload-instructions drop-instructions"><?php _e( 'Drop files to upload' ); ?></h2>
 				<p class="upload-instructions drop-instructions"><?php _ex( 'or', 'Uploader: Drop files here - or - Select Files' ); ?></p>
-				<button type="button" class="browser button button-hero"><?php _e( 'Select Files' ); ?></button>
+				<button type="button" class="browser button button-hero" aria-labelledby="post-upload-info"><?php _e( 'Select Files' ); ?></button>
 			</div>
 
-			<div class="upload-inline-status"></div>
+			<div class="upload-inline-status" aria-live="assertive"></div>
 
-			<div class="post-upload-ui">
+			<div class="post-upload-ui" id="post-upload-info">
 				<?php
 				/** This action is documented in wp-admin/includes/media.php */
 				do_action( 'pre-upload-ui' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
@@ -330,7 +330,7 @@ function wp_print_media_templates() {
 			<span class="upload-detail-separator">&ndash;</span>
 			<span class="upload-filename"></span>
 		</div>
-		<div class="upload-errors"></div>
+		<div class="upload-errors" aria-live="assertive"></div>
 	</script>
 
 	<?php // Template for the uploading status errors. ?>