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Test Info:
<!DOCTYPE html>
<head>
</head>
<body>
<template id="template">
<style>
.a:empty + .b { color: green; }
</style>
<span class="a">Some text</span>
<span class="b">This should be green</span>
<slot/>
</template>
<custom-element id="foo"></custom-element>
<script>
customElements.define("custom-element", class extends HTMLElement {
constructor() {
super();
const template = document.getElementById("template");
const shadowRoot = this.attachShadow({mode: "open"})
.appendChild(template.content.cloneNode(true));
}
nixText() {
this.shadowRoot.children[1].textContent = "";
}
});
window.onload = function() {
var el = document.getElementById("foo");
// Flush its layout
el.offsetWidth;
el.nixText();
document.documentElement.className = "";
}
</script>
</body>
</html>