feat(rule): Label and Name from Content mismatch WCAG21 (Issue #1149)

doc/rule-descriptions.md

@@ -41,7 +41,7 @@
 | image-alt                           | Ensures <img> elements have alternate text or a role of none or presentation                                         | Critical           | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a          | true               |
 | image-redundant-alt                 | Ensure button and link text is not repeated as image alternative                                                           | Minor              | cat.text-alternatives, best-practice                                         | true               |
 | input-image-alt                     | Ensures <input type="image"> elements have alternate text                                                  | Critical           | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a          | true               |
-| label-content-name-mismatch         | Ensures that elements labeled through their content must have their visible text as part of their accessible name          | Serious            | wcag21a, wcag253, experimental                                               | true               |
+| label-content-name-mismatch         | Ensures that elements labelled through their content must have their visible text as part of their accessible name         | Serious            | wcag21a, wcag253, experimental                                               | true               |
 | label-title-only                    | Ensures that every form element is not solely labeled using the title or aria-describedby attributes                       | Serious            | cat.forms, best-practice                                                     | true               |
 | label                               | Ensures every form element has a label                                                                                     | Minor, Critical    | cat.forms, wcag2a, wcag332, wcag131, section508, section508.22.n             | true               |
 | landmark-banner-is-top-level        | Ensures the banner landmark is at top level                                                                                | Moderate           | cat.semantics, best-practice                                                 | true               |

lib/checks/label/label-content-name-mismatch.js

@@ -1,25 +1,48 @@
-const {
-	text: {
-		accessibleText,
-		visible // get visible text
+const { text } = axe.commons;
+
+const accText = text.sanitize(text.accessibleText(node)).toLowerCase();
+if (text.isHumanInterpretable(accText) <= 0) {
+	return undefined;
+}
+
+const visibleText = text
+	.sanitize(text.visibleVirtual(virtualNode))
+	.toLowerCase();
+if (text.isHumanInterpretable(visibleText) <= 0) {
+	if (isStringContained(visibleText, accText)) {
+		return true;
 	}
-} = axe.commons;
+	return undefined;
+}
+
+return isStringContained(visibleText, accText);
 
 /**
- * Note:
- * `label-content-name-mismatch-matches` ignore `node`
- * if there is no `accessibleText` or `textContent`
+ * Check if a given text exists in another
+ *
+ * @param {String} compare given text to check
+ * @param {String} compareWith text against which to be compared
+ * @returns {Boolean}
  */
-const accText = accessibleText(node).toLowerCase();
-const visibleTextContent = visible(node).toLowerCase();
+function isStringContained(compare, compareWith) {
+	const curatedCompareWith = curateString(compareWith);
+	const curatedCompare = curateString(compare);
+	if (!curatedCompareWith || !curatedCompare) {
+		return false;
+	}
+	return curatedCompareWith.includes(curatedCompare);
+}
 
 /**
- * if `textContent` is not part of `accessibleText` -> fail
+ * Curate given text, by removing emoji's, punctuations, unicode and trimming.
+ *
+ * @param {String} str given text to curate
+ * @returns {String}
  */
-
-if (!accText.includes(visibleTextContent)) {
-	return false;
+function curateString(str) {
+	return text.sanitize(
+		text.replacePunctuation(
+			text.replaceNonBmpUnicode(text.replaceEmojiUnicode(str))
+		)
+	);
 }
-
-// -> pass
-return true;

lib/checks/label/label-content-name-mismatch.json

@@ -5,7 +5,7 @@
 		"impact": "serious",
 		"messages": {
 			"pass": "Element contains visible text as part of it's accessible name",
-			"fail": "The visible text of the element is different from it's accessible name"
+			"fail": "Text inside the element is not included in the accessible name"
 		}
 	}
 }

lib/commons/aria/index.js

@@ -2353,3 +2353,45 @@ lookupTable.evaluateRoleForElement = {
 		return out;
 	}
 };
+
+/**
+ * Reference -> https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Techniques#Widget_roles
+ * The current lookupTable.role['widget'] widget, yeilds
+ * ->
+ * [
+ * 	"alert", "alertdialog", "button", "checkbox", "dialog", "gridcell", "link", "log", "marquee", "menuitem", "menuitemcheckbox",
+ * 	"menuitemradio", "option", "progressbar", "radio", "scrollbar", "searchbox", "slider", "spinbutton", "status", "switch", "tab", "tabpanel",
+ * 	"textbox", "timer", "tooltip", "treeitem"
+ * ]
+ * There are some differences against specs, hence the below listing was made
+ */
+lookupTable.rolesOfType = {
+	widget: [
+		'button',
+		'checkbox',
+		'dialog',
+		'gridcell',
+		'heading',
+		'link',
+		'log',
+		'marquee',
+		'menuitem',
+		'menuitemcheckbox',
+		'menuitemradio',
+		'option',
+		'progressbar',
+		'radio',
+		'scrollbar',
+		'slider',
+		'spinbutton',
+		'status',
+		'switch',
+		'tab',
+		'tabpanel',
+		'textbox',
+		'timer',
+		'tooltip',
+		'tree',
+		'treeitem'
+	]
+};

lib/commons/text/is-human-interpretable.js

@@ -0,0 +1,69 @@
+/* global text */
+
+/**
+ * Determines if a given text is human friendly and interpretable
+ *
+ * @method isHumanInterpretable
+ * @memberof axe.commons.text
+ * @instance
+ * @param  {String} str text to be validated
+ * @returns {Number}
+ */
+text.isHumanInterpretable = function(str) {
+	/**
+	 * Steps:
+	 * 1) Check for single character edge cases
+	 * 		a) handle if character is alphanumeric & within the given icon mapping
+	 * 					eg: x (close), i (info)
+	 * 2) handle if character is a known punctuation used as a text
+	 * 					eg: ? (help), > (next arrow), < (back arrow), need help ?
+	 * 3) handle unicode from astral  (non bilingual multi plane) unicode and emoji
+	 * 					eg: Windings font
+	 * 					eg: '💪'
+	 * 					eg: I saw a shooting 💫
+	 */
+
+	if (!str.length) {
+		return 0;
+	}
+
+	// Step 1
+	if (str.length === 1) {
+		const alphaNumericIconMap = [
+			'x', // close
+			'i' // info
+		];
+		// Step 1a
+		if (isAlphanumeric(str) && alphaNumericIconMap.includes(str)) {
+			return 0;
+		}
+	}
+
+	// Step 2
+	if (text.hasPunctuation(str)) {
+		if (text.sanitize(text.replacePunctuation(str)).length <= 0) {
+			return 0;
+		}
+	}
+
+	// Step 3
+	// a - check for astral (non bilingual multi plane unicode)
+	if (text.isNonBmpUnicode(str) || text.isEmojiUnicode(str)) {
+		return 0;
+	}
+
+	return 1;
+};
+
+/**
+ * Check if a given string is alphanumeric
+ *
+ * @private
+ *
+ * @param {String} str given string to validate
+ * @return {Boolean}
+ */
+function isAlphanumeric(str) {
+	const rExp = /^[0-9A-Za-z]+$/;
+	return rExp.test(str);
+}

lib/commons/text/punctuation.js

@@ -0,0 +1,49 @@
+/* global text */
+
+/**
+ * Checks if punctuation's exist in a given string
+ *
+ * @method hasPunctuation
+ * @memberof axe.commons.text
+ * @instance
+ * @param {String} str given string
+ * @returns {String}
+ */
+text.hasPunctuation = function hasPunctuation(str) {
+	return getPunctuationRegExp().test(str);
+};
+
+/**
+ * Replace punctuation's from a given string
+ *
+ * @method replacePunctuation
+ * @memberof axe.commons.text
+ * @instance
+ * @param {String} str given string
+ * @param {String} replaceWith (Optional) replacement string
+ * @returns {String}
+ */
+text.replacePunctuation = function replacePunctuation(str, replaceWith = '') {
+	return str.replace(getPunctuationRegExp(), replaceWith);
+};
+
+/**
+ * Get regular expression for matching punctuations
+ *
+ * @returns {RegExp}
+ */
+function getPunctuationRegExp() {
+	/**
+	 * Reference: http://kunststube.net/encoding/
+	 * US-ASCII
+	 * -> !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
+	 *
+	 * General Punctuation block
+	 * -> \u2000-\u206F
+	 *
+	 * Supplemental Punctuation block
+	 * Reference: https://en.wikipedia.org/wiki/Supplemental_Punctuation
+	 * -> \u2E00-\u2E7F Reference
+	 */
+	return /[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,\-.\/:;<=>?@\[\]^_`{|}~]/g;
+}

lib/commons/text/unicode.js

@@ -0,0 +1,111 @@
+/* global text */
+
+/**
+ * Regex for matching unicode values out of Basic Multilingual Plane (BMP)
+ *
+ * Reference:
+ * - https://github.com/mathiasbynens/regenerate
+ * - https://unicode-table.com/
+ * - https://mathiasbynens.be/notes/javascript-unicode
+ * -
+ */
+
+/**
+ * Determine if a given string contains code points that are not from basic multilingual plane
+ *
+ * @method isNonBmpUnicode
+ * @memberof axe.commons.text
+ * @instance
+ * @param {String} str string to verify
+ * @returns {Boolean}
+ */
+text.isNonBmpUnicode = function isNonBmpUnicode(str) {
+	return getUnicodeRegExp().nonBmp.test(str);
+};
+
+/**
+ * Replace non basic multilingual plane characters with supplied alternative
+ *
+ * @method replaceNonBmpUnicode
+ * @memberof axe.commons.text
+ * @instance
+ * @param {String} str string to operate on
+ * @returns {String}
+ */
+text.replaceNonBmpUnicode = function replaceNonBmpUnicode(
+	str,
+	replaceWith = ''
+) {
+	return str.replace(getUnicodeRegExp().nonBmp, replaceWith);
+};
+
+/**
+ * Determine if a given string contains emoji
+ *
+ * @method isEmojiUnicode
+ * @memberof axe.commons.text
+ * @instance
+ * @param {String} str string to verify
+ * @returns {Boolean}
+ */
+text.isEmojiUnicode = function isEmojiUnicode(str) {
+	return getUnicodeRegExp().emoji.test(str);
+};
+
+/**
+ * Replace astral plane unicode with a given replacement value
+ *
+ * @method replaceEmojiUnicode
+ * @memberof axe.commons.text
+ * @instance
+ * @param {String} str string to operate on
+ * @returns {String}
+ */
+text.replaceEmojiUnicode = function replaceEmojiUnicode(str, replaceWith = '') {
+	return str.replace(getUnicodeRegExp().emoji, replaceWith);
+};
+
+/**
+ * Get regular expression for matching unicode
+ *
+ * @returns {RegExp}
+ */
+function getUnicodeRegExp() {
+	return {
+		/**
+		 * Regex for matching astral plane unicode
+		 * - http://kourge.net/projects/regexp-unicode-block
+		 */
+		nonBmp: new RegExp(
+			'[' +
+			'\u1D00-\u1D7F' + // Phonetic Extensions
+			'\u1D80-\u1DBF' + // Phonetic Extensions Supplement
+			'\u1DC0-\u1DFF' + // Combining Diacritical Marks Supplement
+			'\u2000-\u206F' + // General punctuation
+			'\u20A0-\u20CF' + // Currency symbols
+			'\u20D0-\u20FF' + // Combining Diacritical Marks for Symbols
+			'\u2100-\u214F' + // Letter like symbols
+			'\u2150-\u218F' + // Number forms (eg: Roman numbers)
+			'\u2190-\u21FF' + // Arrows
+			'\u2200-\u22FF' + // Mathematical operators
+			'\u2300-\u23FF' + // Misc Technical
+			'\u2400-\u243F' + // Control pictures
+			'\u2440-\u245F' + // OCR
+			'\u2460-\u24FF' + // Enclosed alpha numerics
+			'\u2500-\u257F' + // Box Drawing
+			'\u2580-\u259F' + // Block Elements
+			'\u25A0-\u25FF' + // Geometric Shapes
+			'\u2600-\u26FF' + // Misc Symbols
+			'\u2700-\u27BF' + // Dingbats
+				']'
+		),
+		/**
+		 * Regex for Emoji matching
+		 * es6(esque) regex using '/u'
+		 *
+		 * - https://github.com/tc39/proposal-regexp-unicode-sequence-properties#matching-all-emoji-including-emoji-sequences
+		 * - https://github.com/mathiasbynens/emoji-regex
+		 */
+		emoji: /\u{1F3F4}(?:\u{E0067}\u{E0062}(?:\u{E0065}\u{E006E}\u{E0067}|\u{E0077}\u{E006C}\u{E0073}|\u{E0073}\u{E0063}\u{E0074})\u{E007F}|\u200D\u2620\uFE0F)|\u{1F469}\u200D\u{1F469}\u200D(?:\u{1F466}\u200D\u{1F466}|\u{1F467}\u200D[\u{1F466}\u{1F467}])|\u{1F468}(?:\u200D(?:\u2764\uFE0F\u200D(?:\u{1F48B}\u200D)?\u{1F468}|[\u{1F468}\u{1F469}]\u200D(?:\u{1F466}\u200D\u{1F466}|\u{1F467}\u200D[\u{1F466}\u{1F467}])|\u{1F466}\u200D\u{1F466}|\u{1F467}\u200D[\u{1F466}\u{1F467}]|[\u{1F33E}\u{1F373}\u{1F393}\u{1F3A4}\u{1F3A8}\u{1F3EB}\u{1F3ED}\u{1F4BB}\u{1F4BC}\u{1F527}\u{1F52C}\u{1F680}\u{1F692}\u{1F9B0}-\u{1F9B3}])|[\u{1F3FB}-\u{1F3FF}]\u200D[\u{1F33E}\u{1F373}\u{1F393}\u{1F3A4}\u{1F3A8}\u{1F3EB}\u{1F3ED}\u{1F4BB}\u{1F4BC}\u{1F527}\u{1F52C}\u{1F680}\u{1F692}\u{1F9B0}-\u{1F9B3}])|\u{1F469}\u200D(?:\u2764\uFE0F\u200D(?:\u{1F48B}\u200D[\u{1F468}\u{1F469}]|[\u{1F468}\u{1F469}])|[\u{1F33E}\u{1F373}\u{1F393}\u{1F3A4}\u{1F3A8}\u{1F3EB}\u{1F3ED}\u{1F4BB}\u{1F4BC}\u{1F527}\u{1F52C}\u{1F680}\u{1F692}\u{1F9B0}-\u{1F9B3}])|\u{1F469}\u200D\u{1F466}\u200D\u{1F466}|(?:\u{1F441}\uFE0F\u200D\u{1F5E8}|\u{1F469}[\u{1F3FB}-\u{1F3FF}]\u200D[\u2695\u2696\u2708]|\u{1F468}(?:[\u{1F3FB}-\u{1F3FF}]\u200D[\u2695\u2696\u2708]|\u200D[\u2695\u2696\u2708])|(?:[\u26F9\u{1F3CB}\u{1F3CC}\u{1F575}]\uFE0F|[\u{1F46F}\u{1F93C}\u{1F9DE}\u{1F9DF}])\u200D[\u2640\u2642]|[\u26F9\u{1F3CB}\u{1F3CC}\u{1F575}][\u{1F3FB}-\u{1F3FF}]\u200D[\u2640\u2642]|[\u{1F3C3}\u{1F3C4}\u{1F3CA}\u{1F46E}\u{1F471}\u{1F473}\u{1F477}\u{1F481}\u{1F482}\u{1F486}\u{1F487}\u{1F645}-\u{1F647}\u{1F64B}\u{1F64D}\u{1F64E}\u{1F6A3}\u{1F6B4}-\u{1F6B6}\u{1F926}\u{1F937}-\u{1F939}\u{1F93D}\u{1F93E}\u{1F9B8}\u{1F9B9}\u{1F9D6}-\u{1F9DD}](?:[\u{1F3FB}-\u{1F3FF}]\u200D[\u2640\u2642]|\u200D[\u2640\u2642])|\u{1F469}\u200D[\u2695\u2696\u2708])\uFE0F|\u{1F469}\u200D\u{1F467}\u200D[\u{1F466}\u{1F467}]|\u{1F469}\u200D\u{1F469}\u200D[\u{1F466}\u{1F467}]|\u{1F468}(?:\u200D(?:[\u{1F468}\u{1F469}]\u200D[\u{1F466}\u{1F467}]|[\u{1F466}\u{1F467}])|[\u{1F3FB}-\u{1F3FF}])|\u{1F3F3}\uFE0F\u200D\u{1F308}|\u{1F469}\u200D\u{1F467}|\u{1F469}[\u{1F3FB}-\u{1F3FF}]\u200D[\u{1F33E}\u{1F373}\u{1F393}\u{1F3A4}\u{1F3A8}\u{1F3EB}\u{1F3ED}\u{1F4BB}\u{1F4BC}\u{1F527}\u{1F52C}\u{1F680}\u{1F692}\u{1F9B0}-\u{1F9B3}]|\u{1F469}\u200D\u{1F466}|\u{1F1F6}\u{1F1E6}|\u{1F1FD}\u{1F1F0}|\u{1F1F4}\u{1F1F2}|\u{1F469}[\u{1F3FB}-\u{1F3FF}]|\u{1F1ED}[\u{1F1F0}\u{1F1F2}\u{1F1F3}\u{1F1F7}\u{1F1F9}\u{1F1FA}]|\u{1F1EC}[\u{1F1E6}\u{1F1E7}\u{1F1E9}-\u{1F1EE}\u{1F1F1}-\u{1F1F3}\u{1F1F5}-\u{1F1FA}\u{1F1FC}\u{1F1FE}]|\u{1F1EA}[\u{1F1E6}\u{1F1E8}\u{1F1EA}\u{1F1EC}\u{1F1ED}\u{1F1F7}-\u{1F1FA}]|\u{1F1E8}[\u{1F1E6}\u{1F1E8}\u{1F1E9}\u{1F1EB}-\u{1F1EE}\u{1F1F0}-\u{1F1F5}\u{1F1F7}\u{1F1FA}-\u{1F1FF}]|\u{1F1F2}[\u{1F1E6}\u{1F1E8}-\u{1F1ED}\u{1F1F0}-\u{1F1FF}]|\u{1F1F3}[\u{1F1E6}\u{1F1E8}\u{1F1EA}-\u{1F1EC}\u{1F1EE}\u{1F1F1}\u{1F1F4}\u{1F1F5}\u{1F1F7}\u{1F1FA}\u{1F1FF}]|\u{1F1FC}[\u{1F1EB}\u{1F1F8}]|\u{1F1FA}[\u{1F1E6}\u{1F1EC}\u{1F1F2}\u{1F1F3}\u{1F1F8}\u{1F1FE}\u{1F1FF}]|\u{1F1F0}[\u{1F1EA}\u{1F1EC}-\u{1F1EE}\u{1F1F2}\u{1F1F3}\u{1F1F5}\u{1F1F7}\u{1F1FC}\u{1F1FE}\u{1F1FF}]|\u{1F1EF}[\u{1F1EA}\u{1F1F2}\u{1F1F4}\u{1F1F5}]|\u{1F1F8}[\u{1F1E6}-\u{1F1EA}\u{1F1EC}-\u{1F1F4}\u{1F1F7}-\u{1F1F9}\u{1F1FB}\u{1F1FD}-\u{1F1FF}]|\u{1F1EE}[\u{1F1E8}-\u{1F1EA}\u{1F1F1}-\u{1F1F4}\u{1F1F6}-\u{1F1F9}]|\u{1F1FF}[\u{1F1E6}\u{1F1F2}\u{1F1FC}]|\u{1F1EB}[\u{1F1EE}-\u{1F1F0}\u{1F1F2}\u{1F1F4}\u{1F1F7}]|\u{1F1F5}[\u{1F1E6}\u{1F1EA}-\u{1F1ED}\u{1F1F0}-\u{1F1F3}\u{1F1F7}-\u{1F1F9}\u{1F1FC}\u{1F1FE}]|\u{1F1E9}[\u{1F1EA}\u{1F1EC}\u{1F1EF}\u{1F1F0}\u{1F1F2}\u{1F1F4}\u{1F1FF}]|\u{1F1F9}[\u{1F1E6}\u{1F1E8}\u{1F1E9}\u{1F1EB}-\u{1F1ED}\u{1F1EF}-\u{1F1F4}\u{1F1F7}\u{1F1F9}\u{1F1FB}\u{1F1FC}\u{1F1FF}]|\u{1F1E7}[\u{1F1E6}\u{1F1E7}\u{1F1E9}-\u{1F1EF}\u{1F1F1}-\u{1F1F4}\u{1F1F6}-\u{1F1F9}\u{1F1FB}\u{1F1FC}\u{1F1FE}\u{1F1FF}]|[#\*0-9]\uFE0F\u20E3|\u{1F1F1}[\u{1F1E6}-\u{1F1E8}\u{1F1EE}\u{1F1F0}\u{1F1F7}-\u{1F1FB}\u{1F1FE}]|\u{1F1E6}[\u{1F1E8}-\u{1F1EC}\u{1F1EE}\u{1F1F1}\u{1F1F2}\u{1F1F4}\u{1F1F6}-\u{1F1FA}\u{1F1FC}\u{1F1FD}\u{1F1FF}]|\u{1F1F7}[\u{1F1EA}\u{1F1F4}\u{1F1F8}\u{1F1FA}\u{1F1FC}]|\u{1F1FB}[\u{1F1E6}\u{1F1E8}\u{1F1EA}\u{1F1EC}\u{1F1EE}\u{1F1F3}\u{1F1FA}]|\u{1F1FE}[\u{1F1EA}\u{1F1F9}]|[\u{1F3C3}\u{1F3C4}\u{1F3CA}\u{1F46E}\u{1F471}\u{1F473}\u{1F477}\u{1F481}\u{1F482}\u{1F486}\u{1F487}\u{1F645}-\u{1F647}\u{1F64B}\u{1F64D}\u{1F64E}\u{1F6A3}\u{1F6B4}-\u{1F6B6}\u{1F926}\u{1F937}-\u{1F939}\u{1F93D}\u{1F93E}\u{1F9B8}\u{1F9B9}\u{1F9D6}-\u{1F9DD}][\u{1F3FB}-\u{1F3FF}]|[\u26F9\u{1F3CB}\u{1F3CC}\u{1F575}][\u{1F3FB}-\u{1F3FF}]|[\u261D\u270A-\u270D\u{1F385}\u{1F3C2}\u{1F3C7}\u{1F442}\u{1F443}\u{1F446}-\u{1F450}\u{1F466}\u{1F467}\u{1F470}\u{1F472}\u{1F474}-\u{1F476}\u{1F478}\u{1F47C}\u{1F483}\u{1F485}\u{1F4AA}\u{1F574}\u{1F57A}\u{1F590}\u{1F595}\u{1F596}\u{1F64C}\u{1F64F}\u{1F6C0}\u{1F6CC}\u{1F918}-\u{1F91C}\u{1F91E}\u{1F91F}\u{1F930}-\u{1F936}\u{1F9B5}\u{1F9B6}\u{1F9D1}-\u{1F9D5}][\u{1F3FB}-\u{1F3FF}]|[\u231A\u231B\u23E9-\u23EC\u23F0\u23F3\u25FD\u25FE\u2614\u2615\u2648-\u2653\u267F\u2693\u26A1\u26AA\u26AB\u26BD\u26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+	};
+}