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<!doctype html>
<meta charset="utf-8">
<title>CSSOM: Correct resolution of resolved value for display-affected pseudo-elements</title>
<link rel="help" href="https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle">
<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Karl Dubost" href="https://github.com/karlcow">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<style>
#test { width: 100px; }
#contents {
display: contents;
border: 10px solid red;
}
#test::before,
#test::after,
#contents::before,
#contents::after,
#flex::before,
#flex::after {
content: " ";
width: 50%;
height: 10px;
display: block;
}
#none {
display: none;
}
#none::before,
#none::after {
content: "Foo";
}
#flex {
display: flex;
}
#flex-no-pseudo {
display: flex;
}
#contents-pseudos::before,
#contents-pseudos::after {
display: contents;
content: "foo";
position: absolute;
}
#contents-pseudos-dynamic::before,
#contents-pseudos-dynamic::after {
display: block;
content: "foo";
position: absolute;
}
#contents-pseudos-dynamic.contents::before,
#contents-pseudos-dynamic.contents::after {
display: contents;
}
#pseudo-invalid::backdrop {
color: rgb(0, 128, 0);
}
#pseudo-invalid::file-selector-button {
color: rgb(0, 128, 0);
}
#pseudo-invalid::grammar-error {
color: rgb(0, 128, 0);
}
#pseudo-invalid::highlight(name) {
color: rgb(0, 128, 0);
}
#pseudo-invalid::marker {
color: rgb(0, 128, 0);
}
#pseudo-invalid::placeholder {
color: rgb(0, 128, 0);
}
#pseudo-invalid::spelling-error {
color: rgb(0, 128, 0);
}
#pseudo-invalid::view-transition {
color: rgb(0, 128, 0);
}
#pseudo-invalid::view-transition-image-pair(name) {
color: rgb(0, 128, 0);
}
#pseudo-invalid::view-transition-group(name) {
color: rgb(0, 128, 0);
}
#pseudo-invalid::view-transition-old(name) {
color: rgb(0, 128, 0);
}
#pseudo-invalid::view-transition-new(name) {
color: rgb(0, 128, 0);
}
#pseudo-invalid {
color: rgb(255, 0, 0)
}
</style>
<div id="test">
<div id="contents"></div>
<div id="none"></div>
<div id="flex"></div>
<div id="flex-no-pseudo"></div>
<div id="contents-pseudos"></div>
<div id="contents-pseudos-dynamic"></div>
<ul><li id="pseudo-invalid">Item</li></ul>
</div>
<script>
test(() => {
const div = document.getElementById('test');
["before", "after"].forEach(pseudo => {
assert_equals(getComputedStyle(div, pseudo).width, "100px");
});
}, "Resolution of width is correct when pseudo-element argument is ignored (due to no colon)");
test(() => {
const div = document.getElementById('test');
[
":before ",
"::before ",
"::before\t",
"::before\f",
"::before\n",
"::before,",
"::before,::after",
"::before@after",
"::before#after",
"::\"before\"",
"::before\u0000",
"::before-->",
"::before0",
].forEach(pseudo => {
assert_equals(getComputedStyle(div, pseudo).width, "", pseudo);
});
}, "Resolution of width is correct when pseudo-element argument is invalid (due to a trailing token)");
test(() => {
const div = document.getElementById('test');
[":before", ":after"].forEach(pseudo => {
assert_equals(getComputedStyle(div, pseudo).width, "50px");
});
}, "Resolution of width is correct for ::before and ::after pseudo-elements (single-colon)");
test(() => {
const div = document.getElementById('test');
["::before", "::after"].forEach(pseudo => {
assert_equals(getComputedStyle(div, pseudo).width, "50px");
});
}, "Resolution of width is correct for ::before and ::after pseudo-elements (double-colon)");
test(function() {
const div = document.getElementById('test');
[":bef\\oRE", "::\\000041fter"].forEach(pseudo => {
assert_equals(getComputedStyle(div, pseudo).width, "50px");
});
}, "Pseudo-elements can use the full range of CSS syntax");
test(function() {
var contents = document.getElementById('contents');
[":before", ":after"].forEach(function(pseudo) {
assert_equals(getComputedStyle(contents, pseudo).width, "50px");
});
}, "Resolution of width is correct for ::before and ::after pseudo-elements of display: contents elements");
test(function() {
var has_no_pseudos = document.body;
has_no_pseudos.style.position = "relative";
[":before", ":after"].forEach(function(pseudo) {
assert_equals(getComputedStyle(has_no_pseudos, pseudo).position, "static",
"Nonexistent " + pseudo + " pseudo-element shouldn't claim to have " +
"the same style as the originating element");
assert_equals(getComputedStyle(has_no_pseudos, pseudo).width, "auto",
"Nonexistent " + pseudo + " pseudo-element shouldn't claim to have " +
"definite size");
});
}, "Resolution of nonexistent pseudo-element styles");
test(function() {
var none = document.getElementById('none');
[":before", ":after"].forEach(function(pseudo) {
assert_equals(getComputedStyle(none, pseudo).content, "\"Foo\"",
"Pseudo-styles of display: none elements should be correct");
});
}, "Resolution of pseudo-element styles in display: none elements");
test(function() {
var flex = document.getElementById('flex');
[":before", ":after"].forEach(function(pseudo) {
assert_equals(getComputedStyle(flex, pseudo).display, "block",
"Pseudo-styles of display: flex elements should get blockified");
});
}, "Item-based blockification of pseudo-elements");
test(function() {
var flexNoPseudo = document.getElementById('flex-no-pseudo');
[":before", ":after"].forEach(function(pseudo) {
assert_equals(getComputedStyle(flexNoPseudo, pseudo).display, "block",
"Pseudo-styles of display: flex elements should get blockified");
});
}, "Item-based blockification of nonexistent pseudo-elements");
test(function() {
var contentsPseudos = document.getElementById('contents-pseudos');
[":before", ":after"].forEach(function(pseudo) {
assert_equals(getComputedStyle(contentsPseudos, pseudo).display, "contents",
"display: contents in " + pseudo + " should get reflected on CSSOM");
assert_equals(getComputedStyle(contentsPseudos, pseudo).width, "auto",
pseudo + " with display: contents should have no box");
assert_equals(getComputedStyle(contentsPseudos, pseudo).position, "absolute",
"display: contents in " + pseudo + " should reflect other non-inherited properties in CSSOM");
});
}, "display: contents on pseudo-elements");
test(function() {
var contentsPseudosDynamic = document.getElementById('contents-pseudos-dynamic');
[":before", ":after"].forEach(function(pseudo) {
assert_equals(getComputedStyle(contentsPseudosDynamic, pseudo).display, "block",
"Check that display for " + pseudo + " is block before change");
});
contentsPseudosDynamic.className = "contents";
[":before", ":after"].forEach(function(pseudo) {
assert_equals(getComputedStyle(contentsPseudosDynamic, pseudo).display, "contents",
"display: contents in " + pseudo + " should get reflected on CSSOM");
assert_equals(getComputedStyle(contentsPseudosDynamic, pseudo).width, "auto",
pseudo + " with display: contents should have no box");
assert_equals(getComputedStyle(contentsPseudosDynamic, pseudo).position, "absolute",
"display: contents in " + pseudo + " should reflect other non-inherited properties in CSSOM");
});
}, "Dynamically change to display: contents on pseudo-elements");
test(() => {
const div = document.getElementById('test');
// Note that these assertions deliberately avoid assert_[not_]equals to
// avoid gCS().length in the failure output.
assert_true(
getComputedStyle(div, "totallynotapseudo").length != 0,
"Should return the element's style for unknown pseudo-elements that don't start with a colon");
assert_true(
getComputedStyle(div, "::totallynotapseudo").length == 0,
"Should return an empty style for unknown pseudo-elements starting with double-colon");
assert_true(
getComputedStyle(div, ":totallynotapseudo").length == 0,
"Should return an empty style for unknown pseudo-elements starting with colon");
}, "Unknown pseudo-elements");
test(() => {
const div = document.getElementById('test');
const style1 = getComputedStyle(div, "totallynotapseudo");
assert_throws_dom("NoModificationAllowedError", () => style1.color = "1");
assert_throws_dom("NoModificationAllowedError", () => style1.margin = "10px");
const style2 = getComputedStyle(div, "::totallynotapseudo");
assert_throws_dom("NoModificationAllowedError", () => style2.color = "1");
assert_throws_dom("NoModificationAllowedError", () => style2.margin = "10px");
const style3 = getComputedStyle(div, ":totallynotapseudo");
assert_throws_dom("NoModificationAllowedError", () => style3.color = "1");
assert_throws_dom("NoModificationAllowedError", () => style3.margin = "10px");
}, "CSSStyleDeclaration is immutable");
// If you add a pseudo-element identifier here, don't forget to add the corresponding style rule in
// <style> above.
[
"backdrop",
"file-selector-button",
"grammar-error",
"highlight(name)",
"marker",
"placeholder",
"spelling-error",
"view-transition",
"view-transition-image-pair(name)",
"view-transition-group(name)",
"view-transition-old(name)",
"view-transition-new(name)"
].forEach(pseudoIdentifier => {
test(() => {
assert_implements_optional(CSS.supports(`selector(::${pseudoIdentifier})`), `::${pseudoIdentifier}`);
const li = document.querySelector('li');
assert_true(
getComputedStyle(li, `:${pseudoIdentifier}`).length == 0,
`Should return an empty style for :${pseudoIdentifier}`);
assert_true(
getComputedStyle(li, pseudoIdentifier).length != 0,
`Should return the element style for ${pseudoIdentifier}`);
assert_equals(
getComputedStyle(li, pseudoIdentifier).color, "rgb(255, 0, 0)",
`Should return the element style for ${pseudoIdentifier}`);
assert_equals(
getComputedStyle(li, `::${pseudoIdentifier}`).color, "rgb(0, 128, 0)",
`Should return the ::${pseudoIdentifier} style`);
}, `Unknown pseudo-element with a known identifier: ${pseudoIdentifier}`);
});
</script>
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