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<!DOCTYPE html>
<title>Pseudo-elements allowed after ::part()</title>
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/">
<meta name="flags" content="ahem">
<link rel="stylesheet" href="/fonts/ahem.css">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../support/parsing-testcommon.js"></script>
<body>
<span style="font-family: Ahem">X</span>
<script>
"use strict";
test_invalid_selector("::part(mypart)::part(anotherpart)");
test_invalid_selector("::part(mypart)::notarealpseudoelement");
test_valid_selector("::part(mypart)::after");
test_valid_selector("::part(mypart)::backdrop");
test_valid_selector("::part(mypart)::before");
test_valid_selector("::part(mypart)::cue");
test_valid_selector("::part(mypart)::details-content");
test_valid_selector("::part(mypart)::file-selector-button");
test_valid_selector("::part(mypart)::first-letter");
test_valid_selector("::part(mypart)::first-line");
test_valid_selector("::part(mypart)::grammar-error");
test_valid_selector("::part(mypart)::highlight(myhighlight)");
test_valid_selector("::part(mypart)::marker");
test_valid_selector("::part(mypart)::placeholder");
test_valid_selector("::part(mypart)::search-text");
test_valid_selector("::part(mypart)::selection");
test_valid_selector("::part(mypart)::spelling-error");
test_valid_selector("::part(mypart)::target-text");
test_valid_selector("::part(mypart)::view-transition");
test_valid_selector("::part(mypart)::view-transition-group(*)");
test_valid_selector("::part(mypart)::view-transition-image-pair(*)");
test_valid_selector("::part(mypart)::view-transition-new(*)");
test_valid_selector("::part(mypart)::view-transition-old(*)");
// to be used inside of a promise_test() function.
async function run_part_test(t, style_rules, part_html, assertion) {
let container = document.createElement("div");
let shadow = container.attachShadow({mode: "open"});
shadow.innerHTML = `
${part_html}
<slot></slot>
`;
document.body.append(container);
let style = document.createElement("style");
style.innerText = style_rules;
document.head.append(style);
t.add_cleanup(() => {
container.remove();
style.remove();
});
await assertion(container, shadow.firstElementChild);
}
function test_with_part(style_rules, part_html, assertion) {
promise_test(async (t) => {
await run_part_test(t, style_rules, part_html, assertion);
}, `::part styles with ${style_rules} and ${part_html}`);
}
// Generate a random-looking color using the string input as a "seed"
// (so different tests use different colors).
function generate_color(str) {
let sum = Array.from(str).reduce((sum, char) => sum + char.charCodeAt(0), 0);
return `rgb(${sum % 255}, ${(sum * 2 + 17) % 255}, ${(sum * 3 + 139) % 255})`;
}
function test_pseudo_computed_style(pseudo_element, tag, attributes) {
promise_test(async (t) => {
let our_color = generate_color(pseudo_element);
await run_part_test(t,
`::part(mypart)${pseudo_element} {
background: ${our_color};
}`,
`<${tag} ${attributes} part='mypart'></${tag}>`,
async (container, part) => {
assert_equals(getComputedStyle(part, pseudo_element).backgroundColor, our_color);
});
}, `computed style for ::part()${pseudo_element}`);
}
test_pseudo_computed_style("::after", "div", "");
test_pseudo_computed_style("::backdrop", "div", "popover='auto'");
test_pseudo_computed_style("::before", "div", "");
// NOTE: not testing :cue at all.
test_pseudo_computed_style("::details-content", "details", "");
test_pseudo_computed_style("::file-selector-button", "input", "type='file'");
test_pseudo_computed_style("::first-letter", "div", "");
test_pseudo_computed_style("::first-line", "div", "");
test_pseudo_computed_style("::grammar-error", "div", "");
test_pseudo_computed_style("::highlight(myhighlight)", "div", "");
test_pseudo_computed_style("::placeholder", "input", "type='text' placeholder='enter text'");
test_pseudo_computed_style("::search-text", "div", "");
test_pseudo_computed_style("::selection", "div", "");
test_pseudo_computed_style("::spelling-error", "div", "");
test_pseudo_computed_style("::target-text", "div", "");
// NOTE: Not yet testing computed style for view transition
// pseudo-elements since they currently only apply to the root element
// (but are intended to apply to others later).
test_with_part(`::part(mypart)::after {
display: block;
content: "";
height: 77px;
}`,
`<div part='mypart'></div>`,
async (container, part) => {
assert_equals(container.getBoundingClientRect().height, 77);
});
test_with_part(`::part(mypart)::before {
display: block;
content: "";
height: 46px;
}`,
`<div part='mypart'></div>`,
async (container, part) => {
assert_equals(container.getBoundingClientRect().height, 46);
});
test_with_part(`::part(mypart)::details-content {
height: 371px;
}`,
`<details part='mypart'><summary style="height:47px">summary</summary>details</details>`,
async (container, part) => {
assert_equals(container.getBoundingClientRect().height, 371 + 47);
});
test_with_part(`::part(mypart)::file-selector-button {
height: 94px;
padding: 0;
margin: 0;
border: none;
appearance: none;
}`,
`<input type=file part=mypart>`,
async (container, part) => {
assert_equals(container.getBoundingClientRect().height, 94);
});
test_with_part(`::part(mypart) {
font: 20px/1 Ahem;
}
::part(mypart)::first-letter {
font-size: 86px;
}`,
`<div part=mypart>X<br>X</div>`,
async (container, part) => {
await document.fonts.ready;
assert_equals(container.getBoundingClientRect().height, 86 + 20);
});
test_with_part(`::part(mypart) {
font: 20px/1 Ahem;
}
::part(mypart)::first-line {
font-size: 86px;
}`,
`<div part=mypart>X<br>X</div>`,
async (container, part) => {
await document.fonts.ready;
assert_equals(container.getBoundingClientRect().height, 86 + 20);
});
test_with_part(`::part(mypart)::marker {
font: 63px/1.0 Ahem;
content: "X";
}`,
`<li style="list-style-position: inside" part="mypart"></li>`,
async (container, part) => {
await document.fonts.ready;
assert_equals(container.getBoundingClientRect().height, 63);
});
</script>
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