feat(link-in-text-block): Add shadow DOM support

Author: WilcoFiers

lib/checks/color/link-in-text-block.js

@@ -1,13 +1,13 @@
 /* global axe*/
-var color = axe.commons.color;
+const { color, dom } = axe.commons;
 
 function getContrast(color1, color2) {
 	var c1lum = color1.getRelativeLuminance();
 	var c2lum = color2.getRelativeLuminance();
 	return (Math.max(c1lum, c2lum) + 0.05) / (Math.min(c1lum, c2lum) + 0.05);
 }
 
-var blockLike = ['block', 'list-item', 'table', 'flex', 'grid', 'inline-block'];
+const blockLike = ['block', 'list-item', 'table', 'flex', 'grid', 'inline-block'];
 function isBlock(elm) {
 	var display = window.getComputedStyle(elm).getPropertyValue('display');
 	return (blockLike.indexOf(display) !== -1 ||
@@ -19,9 +19,9 @@ if (isBlock(node)) {
 	return false;
 }
 
-var parentBlock = node.parentNode;
+var parentBlock = dom.getComposedParent(node);
 while (parentBlock.nodeType === 1 && !isBlock(parentBlock)) {
-	parentBlock = parentBlock.parentNode;
+	parentBlock = dom.getComposedParent(parentBlock);
 }
 
 this.relatedNodes([ parentBlock ]);

test/checks/color/link-in-text-block.js

@@ -2,6 +2,7 @@ describe('link-in-text-block', function () {
 	'use strict';
 
 	var fixture = document.getElementById('fixture');
+	var shadowSupport = axe.testUtils.shadowSupport;
 	var styleElm;
 
 	var checkContext = {
@@ -48,12 +49,12 @@ describe('link-in-text-block', function () {
 			if (defaultStyle.hasOwnProperty(prop)) {
 				styleObj[prop] = defaultStyle[prop];
 			}
-    	}
+		}
 		for (prop in outerStyle) {
 			if (outerStyle.hasOwnProperty(prop)) {
 				styleObj[prop] = outerStyle[prop];
 			}
-    	}
+		}
 
 		var cssLines = Object.keys(styleObj).map(function (prop) {
 			// Make camelCase prop dash separated
@@ -143,6 +144,45 @@ describe('link-in-text-block', function () {
 			axe.commons.color.elementIsDistinct = orig;
 		});
 
+		(shadowSupport.v1 ? it : xit)('works with the block outside the shadow tree', function () {
+			var parentElm = document.createElement('div');
+			var shadow = parentElm.attachShadow({ mode: 'open' });
+			shadow.innerHTML = '<a href="">Link</a>';
+			var linkElm = shadow.querySelector('a');
+			fixture.appendChild(parentElm);
+
+			var orig = axe.commons.color.elementIsDistinct;
+			axe.commons.color.elementIsDistinct = function (arg1, arg2) {
+				assert.deepEqual(arg1, linkElm);
+				assert.deepEqual(arg2, parentElm);
+				return orig(arg1, arg2);
+			};
+
+			checks['link-in-text-block'].evaluate.call(checkContext, linkElm);
+			axe.commons.color.elementIsDistinct = orig;
+		});
+
+		(shadowSupport.v1 ? it : xit)('works with the link inside the shadow tree slot', function () {
+			var div = document.createElement('div');
+			div.innerHTML = '<a href="">Link</a>';
+			var shadow = div.attachShadow({ mode: 'open' });
+			shadow.innerHTML = '<p><slot></slot></p>';
+			fixture.appendChild(div);
+
+			var linkElm = div.querySelector('a');
+			var parentElm = shadow.querySelector('p');
+
+			var orig = axe.commons.color.elementIsDistinct;
+			axe.commons.color.elementIsDistinct = function (arg1, arg2) {
+				assert.deepEqual(arg1, linkElm);
+				assert.deepEqual(arg2, parentElm);
+				return orig(arg1, arg2);
+			};
+
+			checks['link-in-text-block'].evaluate.call(checkContext, linkElm);
+			axe.commons.color.elementIsDistinct = orig;
+		});
+
 	});
 
 
@@ -208,16 +248,16 @@ describe('link-in-text-block', function () {
 	});
 
 	it('returns relatedNodes with undefined', function () {
-			var linkElm = getLinkElm({ }, {
-				color: '#000010',
-				backgroundImage: 'url(data:image/gif;base64,R0lGODlhEAAQAMQAAORHHOVSKudfOulrSOp3WOyDZu6QdvCchPGolfO0o/XBs/fNwfjZ0frl3/zy7////wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAkAABAALAAAAAAQABAAAAVVICSOZGlCQAosJ6mu7fiyZeKqNKToQGDsM8hBADgUXoGAiqhSvp5QAnQKGIgUhwFUYLCVDFCrKUE1lBavAViFIDlTImbKC5Gm2hB0SlBCBMQiB0UjIQA7)'
-			}, {
-				color: '#000000'
-			});
-			assert.isUndefined(checks['link-in-text-block'].evaluate.call(checkContext, linkElm));
-			assert.equal(
-				checkContext._relatedNodes[0],
-				linkElm.parentNode
-			);
+		var linkElm = getLinkElm({ }, {
+			color: '#000010',
+			backgroundImage: 'url(data:image/gif;base64,R0lGODlhEAAQAMQAAORHHOVSKudfOulrSOp3WOyDZu6QdvCchPGolfO0o/XBs/fNwfjZ0frl3/zy7////wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAkAABAALAAAAAAQABAAAAVVICSOZGlCQAosJ6mu7fiyZeKqNKToQGDsM8hBADgUXoGAiqhSvp5QAnQKGIgUhwFUYLCVDFCrKUE1lBavAViFIDlTImbKC5Gm2hB0SlBCBMQiB0UjIQA7)'
+		}, {
+			color: '#000000'
 		});
+		assert.isUndefined(checks['link-in-text-block'].evaluate.call(checkContext, linkElm));
+		assert.equal(
+			checkContext._relatedNodes[0],
+			linkElm.parentNode
+		);
+	});
 });