Fixes https://github.com/microsoft/monaco-editor/issues/4021

src/vs/editor/browser/controller/textAreaHandler.ts

@@ -177,6 +177,7 @@ export class TextAreaHandler extends ViewPart {
 		this.textArea.setAttribute('autocomplete', 'off');
 		this.textArea.setAttribute('spellcheck', 'false');
 		this.textArea.setAttribute('aria-label', this._getAriaLabel(options));
+		this.textArea.setAttribute('aria-required', options.get(EditorOption.ariaRequired) ? 'true' : 'false');
 		this.textArea.setAttribute('tabindex', String(options.get(EditorOption.tabIndex)));
 		this.textArea.setAttribute('role', 'textbox');
 		this.textArea.setAttribute('aria-roledescription', nls.localize('editor', "editor"));
@@ -601,6 +602,7 @@ export class TextAreaHandler extends ViewPart {
 		const { tabSize } = this._context.viewModel.model.getOptions();
 		this.textArea.domNode.style.tabSize = `${tabSize * this._fontInfo.spaceWidth}px`;
 		this.textArea.setAttribute('aria-label', this._getAriaLabel(options));
+		this.textArea.setAttribute('aria-required', options.get(EditorOption.ariaRequired) ? 'true' : 'false');
 		this.textArea.setAttribute('tabindex', String(options.get(EditorOption.tabIndex)));
 
 		if (e.hasChanged(EditorOption.domReadOnly) || e.hasChanged(EditorOption.readOnly)) {

src/vs/editor/common/config/editorOptions.ts

@@ -58,6 +58,11 @@ export interface IEditorOptions {
 	 * The aria label for the editor's textarea (when it is focused).
 	 */
 	ariaLabel?: string;
+
+	/**
+	 * Whether the aria-required attribute should be set on the editors textarea.
+	 */
+	ariaRequired?: boolean;
 	/**
 	 * Control whether a screen reader announces inline suggestion content immediately.
 	 */
@@ -4972,6 +4977,7 @@ export const enum EditorOption {
 	accessibilitySupport,
 	accessibilityPageSize,
 	ariaLabel,
+	ariaRequired,
 	autoClosingBrackets,
 	screenReaderAnnounceInlineSuggestion,
 	autoClosingDelete,
@@ -5142,6 +5148,9 @@ export const EditorOptions = {
 	ariaLabel: register(new EditorStringOption(
 		EditorOption.ariaLabel, 'ariaLabel', nls.localize('editorViewAccessibleLabel', "Editor content")
 	)),
+	ariaRequired: register(new EditorBooleanOption(
+		EditorOption.ariaRequired, 'ariaRequired', false, undefined
+	)),
 	screenReaderAnnounceInlineSuggestion: register(new EditorBooleanOption(
 		EditorOption.screenReaderAnnounceInlineSuggestion, 'screenReaderAnnounceInlineSuggestion', true,
 		{

src/vs/editor/common/standalone/standaloneEnums.ts

@@ -178,146 +178,147 @@ export enum EditorOption {
 	accessibilitySupport = 2,
 	accessibilityPageSize = 3,
 	ariaLabel = 4,
-	autoClosingBrackets = 5,
-	screenReaderAnnounceInlineSuggestion = 6,
-	autoClosingDelete = 7,
-	autoClosingOvertype = 8,
-	autoClosingQuotes = 9,
-	autoIndent = 10,
-	automaticLayout = 11,
-	autoSurround = 12,
-	bracketPairColorization = 13,
-	guides = 14,
-	codeLens = 15,
-	codeLensFontFamily = 16,
-	codeLensFontSize = 17,
-	colorDecorators = 18,
-	colorDecoratorsLimit = 19,
-	columnSelection = 20,
-	comments = 21,
-	contextmenu = 22,
-	copyWithSyntaxHighlighting = 23,
-	cursorBlinking = 24,
-	cursorSmoothCaretAnimation = 25,
-	cursorStyle = 26,
-	cursorSurroundingLines = 27,
-	cursorSurroundingLinesStyle = 28,
-	cursorWidth = 29,
-	disableLayerHinting = 30,
-	disableMonospaceOptimizations = 31,
-	domReadOnly = 32,
-	dragAndDrop = 33,
-	dropIntoEditor = 34,
-	emptySelectionClipboard = 35,
-	experimentalWhitespaceRendering = 36,
-	extraEditorClassName = 37,
-	fastScrollSensitivity = 38,
-	find = 39,
-	fixedOverflowWidgets = 40,
-	folding = 41,
-	foldingStrategy = 42,
-	foldingHighlight = 43,
-	foldingImportsByDefault = 44,
-	foldingMaximumRegions = 45,
-	unfoldOnClickAfterEndOfLine = 46,
-	fontFamily = 47,
-	fontInfo = 48,
-	fontLigatures = 49,
-	fontSize = 50,
-	fontWeight = 51,
-	fontVariations = 52,
-	formatOnPaste = 53,
-	formatOnType = 54,
-	glyphMargin = 55,
-	gotoLocation = 56,
-	hideCursorInOverviewRuler = 57,
-	hover = 58,
-	inDiffEditor = 59,
-	inlineSuggest = 60,
-	letterSpacing = 61,
-	lightbulb = 62,
-	lineDecorationsWidth = 63,
-	lineHeight = 64,
-	lineNumbers = 65,
-	lineNumbersMinChars = 66,
-	linkedEditing = 67,
-	links = 68,
-	matchBrackets = 69,
-	minimap = 70,
-	mouseStyle = 71,
-	mouseWheelScrollSensitivity = 72,
-	mouseWheelZoom = 73,
-	multiCursorMergeOverlapping = 74,
-	multiCursorModifier = 75,
-	multiCursorPaste = 76,
-	multiCursorLimit = 77,
-	occurrencesHighlight = 78,
-	overviewRulerBorder = 79,
-	overviewRulerLanes = 80,
-	padding = 81,
-	pasteAs = 82,
-	parameterHints = 83,
-	peekWidgetDefaultFocus = 84,
-	definitionLinkOpensInPeek = 85,
-	quickSuggestions = 86,
-	quickSuggestionsDelay = 87,
-	readOnly = 88,
-	readOnlyMessage = 89,
-	renameOnType = 90,
-	renderControlCharacters = 91,
-	renderFinalNewline = 92,
-	renderLineHighlight = 93,
-	renderLineHighlightOnlyWhenFocus = 94,
-	renderValidationDecorations = 95,
-	renderWhitespace = 96,
-	revealHorizontalRightPadding = 97,
-	roundedSelection = 98,
-	rulers = 99,
-	scrollbar = 100,
-	scrollBeyondLastColumn = 101,
-	scrollBeyondLastLine = 102,
-	scrollPredominantAxis = 103,
-	selectionClipboard = 104,
-	selectionHighlight = 105,
-	selectOnLineNumbers = 106,
-	showFoldingControls = 107,
-	showUnused = 108,
-	snippetSuggestions = 109,
-	smartSelect = 110,
-	smoothScrolling = 111,
-	stickyScroll = 112,
-	stickyTabStops = 113,
-	stopRenderingLineAfter = 114,
-	suggest = 115,
-	suggestFontSize = 116,
-	suggestLineHeight = 117,
-	suggestOnTriggerCharacters = 118,
-	suggestSelection = 119,
-	tabCompletion = 120,
-	tabIndex = 121,
-	unicodeHighlighting = 122,
-	unusualLineTerminators = 123,
-	useShadowDOM = 124,
-	useTabStops = 125,
-	wordBreak = 126,
-	wordSeparators = 127,
-	wordWrap = 128,
-	wordWrapBreakAfterCharacters = 129,
-	wordWrapBreakBeforeCharacters = 130,
-	wordWrapColumn = 131,
-	wordWrapOverride1 = 132,
-	wordWrapOverride2 = 133,
-	wrappingIndent = 134,
-	wrappingStrategy = 135,
-	showDeprecated = 136,
-	inlayHints = 137,
-	editorClassName = 138,
-	pixelRatio = 139,
-	tabFocusMode = 140,
-	layoutInfo = 141,
-	wrappingInfo = 142,
-	defaultColorDecorators = 143,
-	colorDecoratorsActivatedOn = 144
+	ariaRequired = 5,
+	autoClosingBrackets = 6,
+	screenReaderAnnounceInlineSuggestion = 7,
+	autoClosingDelete = 8,
+	autoClosingOvertype = 9,
+	autoClosingQuotes = 10,
+	autoIndent = 11,
+	automaticLayout = 12,
+	autoSurround = 13,
+	bracketPairColorization = 14,
+	guides = 15,
+	codeLens = 16,
+	codeLensFontFamily = 17,
+	codeLensFontSize = 18,
+	colorDecorators = 19,
+	colorDecoratorsLimit = 20,
+	columnSelection = 21,
+	comments = 22,
+	contextmenu = 23,
+	copyWithSyntaxHighlighting = 24,
+	cursorBlinking = 25,
+	cursorSmoothCaretAnimation = 26,
+	cursorStyle = 27,
+	cursorSurroundingLines = 28,
+	cursorSurroundingLinesStyle = 29,
+	cursorWidth = 30,
+	disableLayerHinting = 31,
+	disableMonospaceOptimizations = 32,
+	domReadOnly = 33,
+	dragAndDrop = 34,
+	dropIntoEditor = 35,
+	emptySelectionClipboard = 36,
+	experimentalWhitespaceRendering = 37,
+	extraEditorClassName = 38,
+	fastScrollSensitivity = 39,
+	find = 40,
+	fixedOverflowWidgets = 41,
+	folding = 42,
+	foldingStrategy = 43,
+	foldingHighlight = 44,
+	foldingImportsByDefault = 45,
+	foldingMaximumRegions = 46,
+	unfoldOnClickAfterEndOfLine = 47,
+	fontFamily = 48,
+	fontInfo = 49,
+	fontLigatures = 50,
+	fontSize = 51,
+	fontWeight = 52,
+	fontVariations = 53,
+	formatOnPaste = 54,
+	formatOnType = 55,
+	glyphMargin = 56,
+	gotoLocation = 57,
+	hideCursorInOverviewRuler = 58,
+	hover = 59,
+	inDiffEditor = 60,
+	inlineSuggest = 61,
+	letterSpacing = 62,
+	lightbulb = 63,
+	lineDecorationsWidth = 64,
+	lineHeight = 65,
+	lineNumbers = 66,
+	lineNumbersMinChars = 67,
+	linkedEditing = 68,
+	links = 69,
+	matchBrackets = 70,
+	minimap = 71,
+	mouseStyle = 72,
+	mouseWheelScrollSensitivity = 73,
+	mouseWheelZoom = 74,
+	multiCursorMergeOverlapping = 75,
+	multiCursorModifier = 76,
+	multiCursorPaste = 77,
+	multiCursorLimit = 78,
+	occurrencesHighlight = 79,
+	overviewRulerBorder = 80,
+	overviewRulerLanes = 81,
+	padding = 82,
+	pasteAs = 83,
+	parameterHints = 84,
+	peekWidgetDefaultFocus = 85,
+	definitionLinkOpensInPeek = 86,
+	quickSuggestions = 87,
+	quickSuggestionsDelay = 88,
+	readOnly = 89,
+	readOnlyMessage = 90,
+	renameOnType = 91,
+	renderControlCharacters = 92,
+	renderFinalNewline = 93,
+	renderLineHighlight = 94,
+	renderLineHighlightOnlyWhenFocus = 95,
+	renderValidationDecorations = 96,
+	renderWhitespace = 97,
+	revealHorizontalRightPadding = 98,
+	roundedSelection = 99,
+	rulers = 100,
+	scrollbar = 101,
+	scrollBeyondLastColumn = 102,
+	scrollBeyondLastLine = 103,
+	scrollPredominantAxis = 104,
+	selectionClipboard = 105,
+	selectionHighlight = 106,
+	selectOnLineNumbers = 107,
+	showFoldingControls = 108,
+	showUnused = 109,
+	snippetSuggestions = 110,
+	smartSelect = 111,
+	smoothScrolling = 112,
+	stickyScroll = 113,
+	stickyTabStops = 114,
+	stopRenderingLineAfter = 115,
+	suggest = 116,
+	suggestFontSize = 117,
+	suggestLineHeight = 118,
+	suggestOnTriggerCharacters = 119,
+	suggestSelection = 120,
+	tabCompletion = 121,
+	tabIndex = 122,
+	unicodeHighlighting = 123,
+	unusualLineTerminators = 124,
+	useShadowDOM = 125,
+	useTabStops = 126,
+	wordBreak = 127,
+	wordSeparators = 128,
+	wordWrap = 129,
+	wordWrapBreakAfterCharacters = 130,
+	wordWrapBreakBeforeCharacters = 131,
+	wordWrapColumn = 132,
+	wordWrapOverride1 = 133,
+	wordWrapOverride2 = 134,
+	wrappingIndent = 135,
+	wrappingStrategy = 136,
+	showDeprecated = 137,
+	inlayHints = 138,
+	editorClassName = 139,
+	pixelRatio = 140,
+	tabFocusMode = 141,
+	layoutInfo = 142,
+	wrappingInfo = 143,
+	defaultColorDecorators = 144,
+	colorDecoratorsActivatedOn = 145
 }
 
 /**