wpt/css/css-fonts/font-size-computed-no-child.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Computed font-size value of a document without child element</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-size-prop">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id="div"></div>

<script>
"use strict";
const div = document.getElementById("div");

test(() => {
  const iframe = document.createElement("iframe");
  div.appendChild(iframe);
  const doc = iframe.contentDocument;
  doc.documentElement.replaceChildren();
  assert_equals(doc.documentElement.firstElementChild, null);
  assert_equals(iframe.contentWindow.getComputedStyle(doc.documentElement).fontSize, "16px");
  iframe.remove();
}, "Initial font-size value of html document without child element");

test(() => {
  const iframe = document.createElement("iframe");
  div.appendChild(iframe);
  const doc = iframe.contentDocument;
  doc.documentElement.replaceChildren();
  doc.documentElement.style.fontSize = "large";
  assert_equals(doc.documentElement.firstElementChild, null);
  assert_equals(iframe.contentWindow.getComputedStyle(doc.documentElement).fontSize, "18px");
  iframe.remove();
}, "Set font-size to html document without child element");

test(() => {
  const iframe = document.createElement("iframe");
  div.appendChild(iframe);
  const doc = iframe.contentDocument;
  doc.documentElement.replaceChildren();
  doc.documentElement.style.fontSize = "calc(1em - 2px)";
  assert_equals(doc.documentElement.firstElementChild, null);
  assert_equals(iframe.contentWindow.getComputedStyle(doc.documentElement).fontSize, "14px");
  iframe.remove();
}, "Set calc font-size to html document without child element");
</script>