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diff --git a/testing/web-platform/tests/css/css-scoping/shadow-cascade-order-001.html b/testing/web-platform/tests/css/css-scoping/shadow-cascade-order-001.html new file mode 100644 index 0000000000..c51696e483 --- /dev/null +++ b/testing/web-platform/tests/css/css-scoping/shadow-cascade-order-001.html @@ -0,0 +1,403 @@ +<!DOCTYPE html> +<html> +<head> +<title>Shadow DOM: CSS Style Rule cascading</title> +<meta name="assert" content="Cascading order test for style rules from various shadow trees."> +<link rel="author" title="Takayoshi Kochi" href="mailto:kochi@google.com"> +<link rel="help" href="https://drafts.csswg.org/css-scoping-1/#shadow-cascading"> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +</head> +<body> +<div id="log"></div> +<script> + +// Taken from the example in +// https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Shadow-DOM-Cascade-Order.md +// https://github.com/w3c/webcomponents/issues/316 +// https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Shadow-DOM-Cascade-Order-in-v1.md +// with element renamed and style rule location changed. +// +// <style>my-item { color: red; }</style> +// <my-list> +// <:shadow> +// <style>::slotted(my-item) { color: blue; }</style> +// <slot/> +// </:shadow> +// <my-item style="color: green;"> +// <:shadow> +// <style>:host { color: yellow; }</style> +// <slot/> +// </:shadow> +// ITEM +// </my-item> +// </my-list> +// +// There are 4 possible style rules that applies to <my-item> above: +// 1. document-wide style +// 2. ::slotted style in the shadow in <my-list> +// 3. :host style in the shadow in <my-item> +// 4. inline style within <my-item> itself. +// +// It could be possible to nest many more shadow trees in <my-list>, +// but to prevent the number of combination explosion, such case is covered +// in another test file. +// +// So testing cases where 2 style rules are competing, +// 4C2 = 6 combinations exist, multiplied by 4, which is the possible +// combination of applying "!important" for the 2 style rules. + +function createMyList(mode, slottedStyle, hostStyle, inlineStyle) { + var myList = document.createElement('my-list'); + var root = myList.attachShadow({'mode': mode}); + root.innerHTML = '<style>' + slottedStyle + '</style><slot></slot>'; + var myItem = document.createElement('my-item'); + if (inlineStyle !== '') + myItem.setAttribute('style', inlineStyle); + myList.appendChild(myItem); + var root2 = myItem.attachShadow({'mode': mode}); + root2.innerHTML = '<style>' + hostStyle + '</style><slot></slot>'; + myItem.appendChild(document.createTextNode('ITEM')); + return myList; +} + +function testCascadingOrder(mode) { + // In all test cases, the rule specified as "color: green" should win. + var testCases = [ + // [A] Cases between document, ::slotteed, :host, and inline + { + title: 'A1. document vs ::slotted, document rule should win', + documentStyle: 'my-item { color: green; }', + slottedStyle: '::slotted(my-item) { color: red; }', + hostStyle: '', + inlineStyle: '' + }, + { + title: 'A2. document vs :host, document rule should win', + documentStyle: 'my-item { color: green; }', + slottedStyle: '', + hostStyle: ':host { color: red; }', + inlineStyle: '' + }, + { + title: 'A3. document vs inline, inline rule should win', + documentStyle: 'my-item { color: red; }', + slottedStyle: '', + hostStyle: '', + inlineStyle: 'color: green;' + }, + { + title: 'A4. ::slotted vs :host, earlier in tree-of-trees rule should win', + documentStyle: '', + slottedStyle: '::slotted(my-item) { color: green; }', + hostStyle: ':host { color: red; }', + inlineStyle: '' + }, + { + title: 'A5. ::slotted vs inline, inline rule should win', + documentStyle: '', + slottedStyle: '::slotted(my-item) { color: red; }', + hostStyle: '', + inlineStyle: 'color: green;' + }, + { + title: 'A6. :host vs inline, inline rule should win', + documentStyle: '', + slottedStyle: '', + hostStyle: ':host { color: red; }', + inlineStyle: 'color: green;' + }, + + // [B] Stronger rule is still stronger with !important + { + title: 'B1. document with !important vs ::slotted, document rule should win', + documentStyle: 'my-item { color: green !important; }', + slottedStyle: '::slotted(my-item) { color: red; }', + hostStyle: '', + inlineStyle: '' + }, + { + title: 'B2. document with !important vs :host, document rule should win', + documentStyle: 'my-item { color: green !important; }', + slottedStyle: '', + hostStyle: ':host { color: red; }', + inlineStyle: '' + }, + { + title: 'B3. document vs inline with !important, inline rule should win', + documentStyle: 'my-item { color: red; }', + slottedStyle: '', + hostStyle: '', + inlineStyle: 'color: green !important;' + }, + { + title: 'B4. ::slotted with !important vs :host, earlier in tree-of-trees rule should win', + documentStyle: '', + slottedStyle: '::slotted(my-item) { color: green !important; }', + hostStyle: ':host { color: red; }', + inlineStyle: '' + }, + { + title: 'B5. ::slotted vs inline with !important, inline rule should win', + documentStyle: '', + slottedStyle: '::slotted(my-item) { color: green !important; }', + hostStyle: '', + inlineStyle: 'color: red;' + }, + { + title: 'B6. :host vs inline with !important, inline rule should win', + documentStyle: '', + slottedStyle: '', + hostStyle: ':host { color: red; }', + inlineStyle: 'color: green !important;' + }, + + // [C] Weaker rule gets stronger with !important + { + title: 'C1. document vs ::slotted with !important, ::slotted rule should win', + documentStyle: 'my-item { color: red; }', + slottedStyle: '::slotted(my-item) { color: green !important; }', + hostStyle: '', + inlineStyle: '' + }, + { + title: 'C2. document vs :host with !important, :host rule should win', + documentStyle: 'my-item { color: red; }', + slottedStyle: '', + hostStyle: ':host { color: green !important; }', + inlineStyle: '' + }, + { + title: 'C3. document with !important vs inline, document rule should win', + documentStyle: 'my-item { color: green !important; }', + slottedStyle: '', + hostStyle: '', + inlineStyle: 'color: red;' + }, + { + title: 'C4. ::slotted vs :host with !important, later in tree-of-trees rule should win', + documentStyle: '', + slottedStyle: '::slotted(my-item) { color: green !important; }', + hostStyle: ':host { color: red; }', + inlineStyle: '' + }, + { + title: 'C5. ::slotted with !important vs inline, ::slotted rule should win', + documentStyle: '', + slottedStyle: '::slotted(my-item) { color: green !important; }', + hostStyle: '', + inlineStyle: 'color: red;' + }, + { + title: 'C6. :host with !important vs inline, :host rule should win', + documentStyle: '', + slottedStyle: '', + hostStyle: ':host { color: green !important; }', + inlineStyle: 'color: red;' + }, + + // [D] Cases between document, ::slotteed, :host, and inline, both with !important + { + title: 'D1. document vs ::slotted both with !important, ::slotted rule should win', + documentStyle: 'my-item { color: red !important; }', + slottedStyle: '::slotted(my-item) { color: green !important; }', + hostStyle: '', + inlineStyle: '' + }, + { + title: 'D2. document vs :host both with !important, :host rule should win', + documentStyle: 'my-item { color: red !important; }', + slottedStyle: '', + hostStyle: ':host { color: green !important; }', + inlineStyle: '' + }, + { + title: 'D3. document vs inline both with !important, inline rule should win', + documentStyle: 'my-item { color: red !important; }', + slottedStyle: '', + hostStyle: '', + inlineStyle: 'color: green !important;' + }, + { + title: 'D4. ::slotted vs :host both with !important, later in tree-of-trees rule should win', + documentStyle: '', + slottedStyle: '::slotted(my-item) { color: red !important; }', + hostStyle: ':host { color: green !important; }', + inlineStyle: '' + }, + { + title: 'D5. ::slotted vs inline both with !important, ::slotted rule should win', + documentStyle: '', + slottedStyle: '::slotted(my-item) { color: green !important; }', + hostStyle: '', + inlineStyle: 'color: red !important;' + }, + { + title: 'D6. :host vs inline both with !important, :host rule should win', + documentStyle: '', + slottedStyle: '', + hostStyle: ':host { color: green !important; }', + inlineStyle: 'color: red !important;' + }, + // [E] Putting all together + { + title: 'E1. all style applied, inline rule should win', + documentStyle: 'my-item { color: red; }', + slottedStyle: '::slotted(my-item) { color: blue; }', + hostStyle: ':host { color: yellow; }', + inlineStyle: 'color: green;' + }, + { + title: 'E2. all styles with !important applied, rule in the last tree-of-trees should win', + documentStyle: 'my-item { color: red !important; }', + slottedStyle: '::slotted(my-item) { color: blue !important; }', + hostStyle: ':host { color: green !important; }', + inlineStyle: 'color: yellow !important;' + }, + ]; + + for (var i = 0; i < testCases.length; ++i) { + var testCase = testCases[i]; + var documentStyle = document.createElement('style'); + documentStyle.appendChild(document.createTextNode(testCase['documentStyle'])); + document.head.appendChild(documentStyle); + + var myList = createMyList(mode, + testCase['slottedStyle'], testCase['hostStyle'], testCase['inlineStyle']); + document.body.appendChild(myList); + + test(function () { + var myItem = myList.querySelector('my-item'); + assert_equals(window.getComputedStyle(myItem).color, 'rgb(0, 128, 0)', + testCase['title']); + }, testCase['title'] + ' for ' + mode + ' mode.'); + + myList.parentNode.removeChild(myList); + document.head.removeChild(documentStyle) + } +} + +// Open or Closed should not make any difference in style application. +testCascadingOrder('open'); +testCascadingOrder('closed'); + + +// Taken from the example in +// https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Shadow-DOM-Cascade-Order.md +// https://github.com/w3c/webcomponents/issues/316 +// https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Shadow-DOM-Cascade-Order-in-v1.md +// with element renamed and style rule location changed. +// +// <style>my-item { color: red; }</style> +// <my-list> +// <:shadow> +// <style>::slotted(my-item) { color: blue; }</style> +// <div> +// <:shadow> +// <slot/> +// </:shadow> +// <slot/> +// </div> +// </:shadow> +// <my-item style="color: green;"> +// <:shadow> +// <style>:host { color: yellow; }</style> +// <slot/> +// </:shadow> +// ITEM +// </my-item> +// </my-list> +// +// The difference from the example tree above is that <my-list> has 2 levels of +// shadow trees, each with ::slotted(my-list) style rules. + +function createMyListWith2LevelShadow(mode, slottedStyle1, slottedStyle2, hostStyle) { + var myList = document.createElement('my-list'); + var root = myList.attachShadow({'mode': mode}); + root.innerHTML = '<style>' + slottedStyle1 + '</style><div><slot></slot></div>'; + var div = root.querySelector('div'); + var root2 = div.attachShadow({'mode': mode}); + root2.innerHTML = '<style>' + slottedStyle2 + '</style><slot></slot>'; + var myItem = document.createElement('my-item'); + myList.appendChild(myItem); + var root3 = myItem.attachShadow({'mode': mode}); + root3.innerHTML = '<style>' + hostStyle + '</style><slot></slot>'; + myItem.appendChild(document.createTextNode('ITEM')); + return myList; +} + +function testCascadingOrderWith2LevelShadow(mode) { + // In all test cases, the rule specified as "color: green" should win. + var testCases = [ + { + title: 'F1. document vs others, document (the first rule in tree-of-trees order) rule should win', + documentStyle: 'my-item { color: green; }', + slottedStyle1: '::slotted(my-item) { color: red; }', + slottedStyle2: '::slotted(my-item) { color: red; }', + hostStyle: ':host { color: red; }', + }, + { + title: 'F2. document with !important vs others, document rule should win', + documentStyle: 'my-item { color: green !important; }', + slottedStyle1: '::slotted(my-item) { color: red; }', + slottedStyle2: '::slotted(my-item) { color: red; }', + hostStyle: ':host { color: red; }', + }, + { + title: 'F3. document vs ::slotted with !important, important rule should win', + documentStyle: 'my-item { color: red; }', + slottedStyle1: '::slotted(my-item) { color: green !important; }', + slottedStyle2: '::slotted(my-item) { color: red; }', + hostStyle: ':host { color: red; }', + }, + { + title: 'F4. document vs ::slotted with !important, important rule should win', + documentStyle: 'my-item { color: red; }', + slottedStyle1: '::slotted(my-item) { color: red; }', + slottedStyle2: '::slotted(my-item) { color: green !important; }', + hostStyle: ':host { color: red; }', + }, + { + title: 'F5. document vs :host with !important, important rule should win', + documentStyle: 'my-item { color: red; }', + slottedStyle1: '::slotted(my-item) { color: red; }', + slottedStyle2: '::slotted(my-item) { color: red; }', + hostStyle: ':host { color: green !important; }', + }, + { + title: 'F6. all rules with !important, the last rule in tree-of-trees should win', + documentStyle: 'my-item { color: red !important; }', + slottedStyle1: '::slotted(my-item) { color: red !important; }', + slottedStyle2: '::slotted(my-item) { color: red !important; }', + hostStyle: ':host { color: green !important ; }', + } + ]; + + for (var i = 0; i < testCases.length; ++i) { + var testCase = testCases[i]; + var documentStyle = document.createElement('style'); + documentStyle.appendChild(document.createTextNode(testCase['documentStyle'])); + document.head.appendChild(documentStyle); + + var myList = createMyListWith2LevelShadow(mode, + testCase['slottedStyle1'], testCase['slottedStyle2'], testCase['hostStyle']); + document.body.appendChild(myList); + + test(function () { + var myItem = myList.querySelector('my-item'); + assert_equals(window.getComputedStyle(myItem).color, 'rgb(0, 128, 0)', + testCase['title']); + }, testCase['title'] + ' for ' + mode + ' mode.'); + + myList.parentNode.removeChild(myList); + document.head.removeChild(documentStyle) + } +} + +// Open or Closed should not make any difference in style application. +testCascadingOrderWith2LevelShadow('open'); +testCascadingOrderWith2LevelShadow('closed'); + +</script> +</body> +</html> |