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Fix :scope selector matching in the case of DocumentFragment/ShadowRoot
When used in querySelector and querySelectorAll, :scope should match the element or the DocumentFragment/ShadowRoot the querySelector is called on. However, WPT adeed in crrev.com/c/1158445 shows that :scope matches nothing when querySelector is called on shadow root, while it works fine when querySelector is called on true element. This CL fixes :scope selector matching process so that :scope itself matches DocumentFragment/ShadowRoot when querySelector is called on DocumentFragment/ShadowRoot. Tests for DocumentFragment are also added in this CL. Link to the spec: https://drafts.csswg.org/selectors-4/#the-scope-pseudo Link to related issue: w3c/csswg-drafts#3016 Link to related CL: crrev.com/c/1158445 Bug: 859692 Change-Id: If20fc4b122d93a553dc478be0ee958958340a34f
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Momoko Sumida
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Chrome-bot
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Sep 10, 2018
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,34 +1,86 @@ | ||
| <!doctype html> | ||
| <link rel='help' href='https://drafts.csswg.org/selectors-4/#the-scope-pseudo'> | ||
| <meta name='description' content=':scope should match when context object is a shadow root'> | ||
| <meta name='description' content=':scope should match when context object is a ShadowRoot or a DocumentFragment'> | ||
| <script src='/resources/testharness.js'></script> | ||
| <script src='/resources/testharnessreport.js'></script> | ||
| <div id='shadowHost'></div> | ||
| <script> | ||
| 'use strict' | ||
| const shadowRoot = shadowHost.attachShadow({mode:'open'}) | ||
| shadowRoot.innerHTML = '<div class="div" id="external_div">Shadow Element<div id="nesteddiv">nested</div></div>'; | ||
| const shadowRoot = shadowHost.attachShadow({mode:'open'}) | ||
| const externalDiv = document.createElement('div'); | ||
| externalDiv.setAttribute('id', 'external'); | ||
| const nestedDiv = document.createElement('div'); | ||
| nestedDiv.setAttribute('id', 'nested'); | ||
| shadowRoot.appendChild(externalDiv); | ||
| externalDiv.appendChild(nestedDiv); | ||
|
|
||
| test(() => { | ||
| assert_equals(shadowRoot.firstChild.querySelectorAll(':scope > div').length, 1, 'should get the number of direct children of external_div'); | ||
| assert_equals(shadowRoot.firstChild.querySelector(':scope > div'), shadowRoot.getElementById("nesteddiv"), 'should get the first direct child of external_div'); | ||
| assert_equals(shadowRoot.firstChild.querySelector(':scope > div').innerHTML, 'nested', 'should get the text in nesteddiv'); | ||
| const nestedShadowRoot = nestedDiv.attachShadow({mode:'open'}) | ||
| const shadowExternalDiv = document.createElement('div'); | ||
| shadowExternalDiv.setAttribute('id', 'shadow_external'); | ||
| const shadowNestedDiv = document.createElement('div'); | ||
| shadowNestedDiv.setAttribute('id', 'shadow_nested'); | ||
| nestedShadowRoot.appendChild(shadowExternalDiv); | ||
| shadowExternalDiv.appendChild(shadowNestedDiv); | ||
|
|
||
| test (() => { | ||
| assert_equals(shadowRoot.firstChild.querySelectorAll(':scope > div').length, 1, 'should get the number of direct children of externalDiv'); | ||
| assert_equals(shadowRoot.firstChild.querySelector(':scope > div'), shadowRoot.getElementById('nested'), 'should get the first direct child of externalDiv'); | ||
| assert_equals(shadowRoot.firstChild.querySelector(':scope > div'), shadowRoot.getElementById('nested'), 'should get nestedDiv'); | ||
| }, 'scope selector works in shadowRoot.firstChild') | ||
|
|
||
| test(() => { | ||
| assert_equals(shadowRoot.querySelector(':scope > div'), shadowRoot.getElementById('external_div'), 'should get the direct child of shadowRoot'); | ||
| test (() => { | ||
| assert_equals(shadowRoot.querySelector(':scope > div'), shadowRoot.getElementById('external'), 'should get the direct child of shadowRoot'); | ||
| assert_equals(shadowRoot.querySelectorAll(':scope > div').length, 1, 'should get the number of direct div children of shadowRoot'); | ||
| }, 'Selecting direct child of shadow root with :scope should work') | ||
|
|
||
| test(() => { | ||
| assert_equals(shadowRoot.querySelector(':scope div'), shadowRoot.getElementById('external_div'), 'should get the first div descendant of shadowRoot'); | ||
| assert_equals(shadowRoot.querySelectorAll(':scope div').length, 2, 'should get the number of the div descendants of shadowRoot'); | ||
| test (() => { | ||
| assert_equals(shadowRoot.querySelector(':scope div'), shadowRoot.getElementById('external'), 'should get the first div descendant of shadowRoot'); | ||
| assert_equals(shadowRoot.querySelectorAll(':scope div').length, 2, 'should get the number of the div descendants of shadowRoot, :scope div should not match for nestedShadow'); | ||
| }, 'Selecting descendants of shadow root with :scope should work') | ||
|
|
||
| test (() => { | ||
| assert_equals(nestedShadowRoot.querySelector(':scope > div'), nestedShadowRoot.getElementById('shadow_external'), 'should get the direct child of nestedShadowRoot'); | ||
| assert_equals(nestedShadowRoot.querySelectorAll(':scope > div').length, 1, 'should get the number of direct div children of nestedShadowRoot'); | ||
| }, 'Selecting direct child of nested shadow root with :scope should work') | ||
|
|
||
| test (() => { | ||
| assert_equals(nestedShadowRoot.querySelector(':scope div'), nestedShadowRoot.getElementById('shadow_external'), 'should get the first div descendant of nestedShadowRoot'); | ||
| assert_equals(nestedShadowRoot.querySelectorAll(':scope div').length, 2, 'should get the number of the div descendants of nestedShadowRoot'); | ||
| }, 'Selecting descendants of nested shadow root with :scope should work') | ||
|
|
||
| const documentFragment = document.createDocumentFragment(); | ||
| const external_div = document.createElement('div'); | ||
| external_div.setAttribute('id', 'external_div'); | ||
| const nested_div = document.createElement('div'); | ||
| nested_div.setAttribute('id', 'nested_div'); | ||
| documentFragment.appendChild(external_div); | ||
| external_div.appendChild(nested_div); | ||
|
|
||
| test(() => { | ||
| assert_equals(documentFragment.firstChild.querySelectorAll(':scope > div').length, 1, 'should get the number of direct children of external_div'); | ||
| assert_equals(documentFragment.firstChild.querySelector(':scope > div'), documentFragment.getElementById('nested_div'), 'should get the first direct child of external_div'); | ||
| assert_equals(documentFragment.firstChild.querySelector(':scope > div'), documentFragment.getElementById('nested_div'), 'should get the text in nesteddiv'); | ||
| }, 'scope selector works in documentFragment.firstChild') | ||
|
|
||
| test(() => { | ||
| assert_equals(documentFragment.querySelector(':scope > div'), documentFragment.getElementById('external_div'), 'should get the direct child of DocumentFragment'); | ||
| assert_equals(documentFragment.querySelectorAll(':scope > div').length, 1, 'should get the number of direct div children of DocumentFragment'); | ||
| }, 'Selecting direct child of document fragment with :scope should work') | ||
|
|
||
| test(() => { | ||
| assert_equals(documentFragment.querySelector(':scope div'), documentFragment.getElementById('external_div'), 'should get the first div descendant of DocumentFragment'); | ||
| assert_equals(documentFragment.querySelectorAll(':scope div').length, 2, 'should get the number of the div descendants of DocumentFragment'); | ||
| }, 'Selecting descendants of document fragment with :scope should work') | ||
|
|
||
| test(() => { | ||
| assert_equals(shadowRoot.firstChild.querySelector(':scope'), null, 'should return null'); | ||
| assert_equals(shadowRoot.firstChild.querySelectorAll(':scope').length, 0, 'should return 0'); | ||
|
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||
| assert_equals(shadowRoot.querySelector(':scope'), null, 'should return null'); | ||
| assert_equals(shadowRoot.querySelectorAll(':scope').length, 0, 'should return 0'); | ||
| }, 'querySelector() with ":scope" should return null, whether the context object is an element or a shadow root') | ||
|
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| assert_equals(documentFragment.querySelector(':scope'), null, 'should return null'); | ||
| assert_equals(documentFragment.querySelectorAll(':scope').length, 0, 'should return 0'); | ||
|
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| }, 'querySelector() with ":scope" should return null, whether the context object is an element, a shadow root or a document fragment') | ||
| </script> |