diff --git a/.Jules/palette.md b/.Jules/palette.md
new file mode 100644
index 00000000..bc0e84d3
--- /dev/null
+++ b/.Jules/palette.md
@@ -0,0 +1,3 @@
+## 2026-06-27 - [CLI Output Accessibility]
+**Learning:** Even simple generated HTML outputs (like static index pages) from CLI tools often lack basic accessibility semantics out-of-the-box. Emoticons (📁, ▹) are insufficient indicators for screen readers identifying interactive elements like file links.
+**Action:** Always inject `aria-label` attributes to explicitly describe interactive items (e.g., "Parent directory", "Directory: folderName") when generating static HTML UI, replacing or augmenting icon-only context.
diff --git a/src/main/kotlin/html4tree/main.kt b/src/main/kotlin/html4tree/main.kt
index 50b2680d..35260166 100644
--- a/src/main/kotlin/html4tree/main.kt
+++ b/src/main/kotlin/html4tree/main.kt
@@ -131,7 +131,8 @@ fun process_dir(curr_dir: File){
         dir_files.forEach {
            val isLinkedDirectory = it.isDirectory() && !java.nio.file.Files.isSymbolicLink(it.toPath())
            if((it.getName() !in exclude) && (isLinkedDirectory || !it.isDirectory())) {
-              l += """          <li><a style="display:block; width:100%" href="${if (isLinkedDirectory) { "./${it.getName().urlEncodePath()}/" } else { "./${it.getName().urlEncodePath()}" }}">${if (isLinkedDirectory) { "&#128193;" } else { "&rtrif;" }} ${it.getName().escapeHtml()}</a></li>"""+"\n"
+              val label = if (isLinkedDirectory) "Directory: ${it.getName().escapeHtml()}" else "File: ${it.getName().escapeHtml()}"
+              l += """          <li><a style="display:block; width:100%" href="${if (isLinkedDirectory) { "./${it.getName().urlEncodePath()}/" } else { "./${it.getName().urlEncodePath()}" }}" aria-label="$label">${if (isLinkedDirectory) { "&#128193;" } else { "&rtrif;" }} ${it.getName().escapeHtml()}</a></li>"""+"\n"
            }
         }
 
diff --git a/src/main/kotlin/html4tree/util.kt b/src/main/kotlin/html4tree/util.kt
index 9a882d74..c8979c31 100644
--- a/src/main/kotlin/html4tree/util.kt
+++ b/src/main/kotlin/html4tree/util.kt
@@ -39,7 +39,7 @@ class LinkedList {
         if(l == null){
             return null
         } else {
-        	l.next = null
+            l.next = null
             return LinkedListEntry(l.data, l.level)
         }
     }
diff --git a/src/test/kotlin/html4tree/LinkedListTest.kt b/src/test/kotlin/html4tree/LinkedListTest.kt
new file mode 100644
index 00000000..8b5eb631
--- /dev/null
+++ b/src/test/kotlin/html4tree/LinkedListTest.kt
@@ -0,0 +1,70 @@
+package html4tree
+
+import org.junit.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNull
+import java.io.File
+
+class LinkedListTest {
+
+    @Test
+    fun testLinkedList() {
+        val ll = LinkedList()
+        assertNull(ll.pull())
+
+        val f1 = File("file1")
+        val f2 = File("file2")
+        val f3 = File("file3")
+
+        ll.push(LinkedListEntry(f1, 0))
+        ll.push(LinkedListEntry(f2, 1))
+        ll.push(LinkedListEntry(f3, 2))
+
+        val e1 = ll.pull()
+        assertEquals(f1, e1?.file)
+        assertEquals(0, e1?.level)
+
+        val e2 = ll.pull()
+        assertEquals(f2, e2?.file)
+        assertEquals(1, e2?.level)
+
+        val e3 = ll.pull()
+        assertEquals(f3, e3?.file)
+        assertEquals(2, e3?.level)
+
+        assertNull(ll.pull())
+    }
+
+    @Test
+    fun testLinkedListSettersGetters() {
+        val ll = LinkedList()
+        val e = Entry(File("a"), 0, null)
+        ll.first = e
+        ll.last = e
+        assertEquals(e, ll.first)
+        assertEquals(e, ll.last)
+    }
+
+    @Test
+    fun testPushToNonEmpty() {
+        val ll = LinkedList()
+        val lle1 = LinkedListEntry(File("1"), 1)
+        val lle2 = LinkedListEntry(File("2"), 2)
+        ll.push(lle1)
+        ll.push(lle2)
+
+        // This exercises the else branch in push
+        assertEquals("2", ll.first?.data?.name)
+        assertEquals("1", ll.last?.data?.name)
+    }
+
+    @Test
+    fun testPushWithNullFirst() {
+        val ll = LinkedList()
+        val lle1 = LinkedListEntry(File("1"), 1)
+        val lle2 = LinkedListEntry(File("2"), 2)
+        ll.push(lle1)
+        ll.first = null // artificially make first null
+        ll.push(lle2) // will trigger first?.next safe calls returning null
+    }
+}
diff --git a/src/test/kotlin/html4tree/MainKtTest.kt b/src/test/kotlin/html4tree/MainKtTest.kt
new file mode 100644
index 00000000..4392c93b
--- /dev/null
+++ b/src/test/kotlin/html4tree/MainKtTest.kt
@@ -0,0 +1,162 @@
+package html4tree
+
+import org.junit.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+import kotlin.test.assertFalse
+import kotlin.test.assertNull
+import java.io.File
+import org.junit.Rule
+import org.junit.rules.TemporaryFolder
+
+class MainKtTest {
+
+    @Rule
+    @JvmField
+    val tempFolder = TemporaryFolder()
+
+    @Test
+    fun testEscapeHtml() {
+        assertEquals("&amp;", "&".escapeHtml())
+        assertEquals("&lt;", "<".escapeHtml())
+        assertEquals("&gt;", ">".escapeHtml())
+        assertEquals("&quot;", "\"".escapeHtml())
+        assertEquals("&#x27;", "'".escapeHtml())
+        assertEquals("test", "test".escapeHtml())
+    }
+
+    @Test
+    fun testUrlEncodePath() {
+        assertEquals("hello%20world", "hello world".urlEncodePath())
+        assertEquals("hello%2Bworld", "hello+world".urlEncodePath())
+        assertEquals("%2Fhello%2Fworld", "/hello/world".urlEncodePath())
+    }
+
+    @Test
+    fun testProcessIgnoreFileNoIgnore() {
+        val dir = tempFolder.newFolder("testdir")
+        val exclude = process_ignore_file(dir)
+        assertEquals(listOf("index.html"), exclude)
+    }
+
+    @Test
+    fun testProcessIgnoreFileWithIgnore() {
+        val dir = tempFolder.newFolder("testdir2")
+        File(dir, "file1.txt").createNewFile()
+        File(dir, "file2.md").createNewFile()
+        val ignoreFile = File(dir, ".html4ignore")
+        ignoreFile.writeText(".*\\.txt")
+
+        val exclude = process_ignore_file(dir)
+        assertTrue(exclude.contains("index.html"))
+        assertTrue(exclude.contains("file1.txt"))
+        assertFalse(exclude.contains("file2.md"))
+    }
+
+    @Test
+    fun testProcessDir() {
+        val dir = tempFolder.newFolder("processdirtest")
+        File(dir, "a.txt").createNewFile()
+        val subdir = File(dir, "subdir")
+        subdir.mkdir()
+        File(dir, ".html4ignore").writeText(".*\\.txt")
+
+        process_dir(dir)
+
+        val indexFile = File(dir, "index.html")
+        assertTrue(indexFile.exists())
+        val content = indexFile.readText()
+        assertTrue(content.contains("<!doctype html>"))
+        assertTrue(content.contains("<html lang=\"ko\">"))
+        assertTrue(content.contains("subdir/"))
+        assertTrue(content.contains("aria-label=\"Directory: subdir\""))
+        assertFalse(content.contains("a.txt")) // ignored
+    }
+
+    @Test
+    fun testGo() {
+        val root = tempFolder.newFolder("root")
+        val subdir1 = File(root, "subdir1")
+        subdir1.mkdir()
+        val subdir2 = File(subdir1, "subdir2")
+        subdir2.mkdir()
+
+        go(root.absolutePath, -1)
+
+        assertTrue(File(root, "index.html").exists())
+        assertTrue(File(subdir1, "index.html").exists())
+        assertTrue(File(subdir2, "index.html").exists())
+    }
+
+    @Test
+    fun testGoMaxLevel() {
+        val root = tempFolder.newFolder("root_max")
+        val subdir1 = File(root, "subdir1")
+        subdir1.mkdir()
+        val subdir2 = File(subdir1, "subdir2")
+        subdir2.mkdir()
+
+        go(root.absolutePath, 0)
+
+        assertTrue(File(root, "index.html").exists())
+        assertFalse(File(subdir1, "index.html").exists())
+        assertFalse(File(subdir2, "index.html").exists())
+    }
+
+    @Test
+    fun testHelp() {
+        // help() just prints to standard output, we just call it to cover it
+        help()
+    }
+
+    @Test
+    fun testCliCommand() {
+        val root = tempFolder.newFolder("cli_test")
+        val cmd = Html4tree()
+        cmd.parse(arrayOf("--max-level", "0", root.absolutePath))
+        assertTrue(File(root, "index.html").exists())
+    }
+
+    @Test
+    fun testMainArgs() {
+        val root = tempFolder.newFolder("main_args_test")
+        html4tree.main(arrayOf(root.absolutePath))
+        assertTrue(File(root, "index.html").exists())
+    }
+
+    @Test(expected = IllegalArgumentException::class)
+    fun testGoRequireFileExists() {
+        go("does_not_exist_xyz", -1)
+    }
+
+    @Test(expected = IllegalArgumentException::class)
+    fun testGoRequireFileIsDirectory() {
+        val f = tempFolder.newFile("not_a_dir.txt")
+        go(f.absolutePath, -1)
+    }
+
+    @Test
+    fun testGoWithNonDirectoryInside() {
+        val root = tempFolder.newFolder("root_mixed")
+        File(root, "file1.txt").createNewFile()
+        val subdir = File(root, "subdir1")
+        subdir.mkdir()
+        File(subdir, "file2.txt").createNewFile()
+
+        go(root.absolutePath, -1)
+
+        assertTrue(File(root, "index.html").exists())
+        assertTrue(File(subdir, "index.html").exists())
+    }
+
+    @Test
+    fun testPullReturnsPushedEntry() {
+        val root = tempFolder.newFolder("root_for_pull")
+        val ll = LinkedList()
+        ll.push(LinkedListEntry(root, 0))
+        val pulled = ll.pull()
+        assertEquals(root, pulled?.file)
+        assertEquals(0, pulled?.level)
+        assertNull(ll.pull())
+    }
+}