Quelle test_dont_use_document_fonts.html Sprache: HTML

products/sources/formale Sprachen/C/Firefox/layout/style/test/test_dont_use_document_fonts.html

<!doctype html>
<title>Test for preference to not use document fonts</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel='stylesheet' href='/resources/testharness.css'>
<div id="content"></div>
<script>
const content = document.getElementById("content");

// This is just a subset of browser.display.use_document_fonts.icon_font_allowlist
// that we feel are worth double-checking via this test.  In particular:
// * Chromium Bug Tracker and https://developers.google.com use "Material Icons"
// * Google Translate and Google Timeline use "Material Icons Extended"
// * https://fonts.google.com/icons uses "Material Symbols Outlined"
// * Google Calendar and Google Contacts use "Google Material Icons"
const kKnownLigatureIconFonts = "Material Icons, Material Icons Extended, " +
      "Material Symbols Outlined, Google Material Icons";

setup({explicit_done: true })

content.style.fontFamily = "initial";
const kInitialFamily = getComputedStyle(content).fontFamily;
content.style.fontFamily = "";

const kTests = [
  {
    specified: "monospace",
    computed: "monospace",
    description: "Single generic family should not be changed",
  },
  {
    specified: "monospace, sans-serif",
    computed: "monospace, sans-serif",
    description: "Generic families should not be changed",
  },
  {
    specified: "Courier, monospace",
    computed: "monospace, Courier",
    description: "Generics are preferred, but may still fall back to document fonts",
  },
  {
    specified: "system-ui, sans-serif",
    computed: "sans-serif, system-ui",
    description: "system-ui is not prioritized",
  },
  {
    specified: "Courier, something-else",
    computed: `${kInitialFamily}, Courier, something-else`,
    description: "Generic is prepended to the font-family if none is found",
  },
  {
    specified: kKnownLigatureIconFonts + ", something-else, sans-serif",
    computed: kKnownLigatureIconFonts + ", sans-serif, something-else",
    description: "Known ligature-icon fonts remain ahead of the generic",
  },
  {
    specified: "Material Icons, something-else, Material Symbols Outlined, sans-serif",
    computed: "Material Icons, sans-serif, something-else, Material Symbols Outlined",
    description: "Generic is moved ahead of the first non-allowlisted font",
  },
  {
    specified: "Material Icons, something-else, Material Symbols Outlined",
    computed: `Material Icons, ${kInitialFamily}, something-else, Material Symbols Outlined`,
    description: "Default generic is inserted ahead of the first non-allowlisted font",
  },
  {
    specified: "Material Icons, cursive, Material Symbols Outlined, serif",
    computed: "Material Icons, serif, cursive, Material Symbols Outlined",
    description: "cursive is not treated as a generic to be prioritized",
  },
  {
    specified: "Material Icons, fantasy, Material Symbols Outlined",
    computed: `Material Icons, ${kInitialFamily}, fantasy, Material Symbols Outlined`,
    description: "fantasy is not treated as a generic to be prioritized",
  },
];

let systemFont;

// compute expectations while the pref is not active yet.
test(function() {
  for (const test of kTests) {
    content.style.fontFamily = "";
    content.style.fontFamily = test.computed;
    assert_not_equals(content.style.fontFamily, "", `computed font ${test.computed} was invalid`);
    test.expected = getComputedStyle(content).fontFamily;
  }

  content.style.font = "menu";
  systemFont = getComputedStyle(content).fontFamily;
  assert_not_equals(systemFont, "", `computed menu system font was invalid`);

  content.style.font = "";
}, "Sanity");

function runTest({ specified, computed, description, expected }) {
  test(function() {
    content.style.fontFamily = "";
    content.style.fontFamily = specified;
    assert_equals(getComputedStyle(content).fontFamily, expected);
  }, description);
}

(async function() {
  await SpecialPowers.pushPrefEnv({'set': [['browser.display.use_document_fonts', 0]]});
  for (const test of kTests)
    runTest(test);

  test(function() {
    content.style.font = "menu";
    assert_equals(getComputedStyle(content).fontFamily, systemFont);
  }, "System font should be honored");

  done();
})();
</script>

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