<!doctype html>
<title>CSS Test: Pseudo-elements and :host selector.</title>
<link rel="author" title="Antti Koivisto" href="mailto:[email protected]"/>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]"/>
<link rel="help" href="https://drafts.csswg.org/css-scoping/#selectors-data-model">
<link rel="match" href="reference/green-box.html"/>
<style>
.test {
width: 100px;
height: 25px;
background: red;
color: red;
}
#host1, #host2 {
color: green;
}
#host3 div, #host4 div {
width: 50%;
height: 100%;
background: green;
display: inline-block;
}
</style>
<p>Test passes if you see a single 100px by 100px green box below.</p>
<div id="host1" class="test"></div>
<div id="host2" class="test"></div>
<div id="host3" class="test"><div>text</div></div>
<div id="host4" class="test"><div>text</div></div>
<script>
host1.attachShadow({mode: 'closed'}).innerHTML = `<style>
:host::before, :host::after {
width: 50%;
height: 100%;
background: green;
display: inline-block;
content: "test";
}
</style>`;
host2.attachShadow({mode: 'closed'}).innerHTML = `<style>
:host(.green)::before, :host(.green)::after {
width: 50%;
height: 100%;
background: green;
display: inline-block;
content: "test";
}
</style>`;
getComputedStyle(host2).backgroundColor;
host2.classList.add('green');
host3.attachShadow({mode: 'closed'}).innerHTML = `<style>
:host {
color: green !important;
}
:host::before {
width: 50%;
height: 100%;
background: green;
display: inline-block;
content: "test";
}
</style><slot></slot>`;
host4.attachShadow({mode: 'closed'}).innerHTML = `<style>
:host(.green) {
color: green !important;
}
:host(.green)::after {
width: 50%;
height: 100%;
background: green;
display: inline-block;
content: "test";
}
</style><slot></slot>`;
getComputedStyle(host4).backgroundColor;
host4.classList.add('green');
</script>
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