viewport-units-after-font-load.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-values/viewport-units-after-font-load.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>CSS Values: Viewport units are computed correctly after font load.</title>

<link rel="author"  title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">

<link rel="author"  title="Mozilla" href="https://mozilla.org">

<link rel="help" href="https://www.w3.org/TR/css-values-3/#viewport-relative-lengths">

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1620359">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<iframe width=300 height=300 scrolling=no srcdoc=""></iframe>

<script>

let t = async_test("Viewport units are correctly updated after resize even if a font load has happened before");

let iframe = document.querySelector("iframe");

onload = t.step_func(function() {

  let doc = iframe.contentDocument;

  let win = iframe.contentWindow;

  doc.body.innerHTML = `

    <div style="width: 100vw; height: 100vh; background: green"></div>

`;

  let div = doc.querySelector("div");

  let oldWidth = win.getComputedStyle(div).width;

  let oldHeight = win.getComputedStyle(div).height;

  assert_equals(oldWidth, win.innerWidth + "px", "Should fill the viewport");

  assert_equals(oldHeight, win.innerHeight + "px", "Should fill the viewport");

  let link = doc.createElement("link");

  link.rel = "stylesheet";

  link.href = "/fonts/ahem.css";

  link.onload = t.step_func(function() {

    iframe.width = 400;

    win.requestAnimationFrame(t.step_func(function() {

      win.requestAnimationFrame(t.step_func_done(function() {

        let newWidth = win.getComputedStyle(div).width;

        let newHeight = win.getComputedStyle(div).height;

        assert_equals(newWidth, win.innerWidth + "px", "Should fill the viewport");

        assert_equals(newHeight, win.innerHeight + "px", "Should fill the viewport");

        assert_equals(newHeight, oldHeight, "Height shouldn't have changed");

        assert_not_equals(newWidth, oldWidth, "Width should have changed");

      }));

    }));

});

  doc.body.appendChild(link);

});

</script>