wpt/css/css-color/light-dark-image.html at master · web-platform-tests/wpt · GitHub

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<!doctype html>
<title>light-dark() with image values</title>
<link rel="author" title="Jason Leo" href="mailto:cgqaq@chromium.org">
<link rel="author" title="一丝" href="mailto:yiorsi@gmail.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/css-color-5/#light-dark">
<div id="light" style="color-scheme: light"></div>
<div id="dark" style="color-scheme: dark"></div>
<div id="inherit-parent" style="color-scheme: dark">
  <div id="inherit-child"></div>
</div>
<script>
function test_light_dark_image(property, value, expected_light, expected_dark) {
  test(() => {
    for (let element of [light, dark]) {
      element.style.setProperty(property, "");
      element.style.setProperty(property, value);
      assert_not_equals(element.style.getPropertyValue(property), "",
                        "Should parse as valid: " + value);
      let computed = getComputedStyle(element).getPropertyValue(property);
      let expected = element.id == "dark" ? expected_dark : expected_light;
      assert_true(computed.endsWith(expected),
                  `Expected "${computed}" to end with "${expected}"`);
      element.style.setProperty(property, "");
    }
  }, `${property}: ${value}`);
}

function test_invalid(property, value) {
  test(() => {
    light.style.setProperty(property, "initial");
    light.style.setProperty(property, value);
    assert_equals(light.style.getPropertyValue(property), "initial",
                  "Should not parse: " + value);
    light.style.setProperty(property, "");
  }, `${property}: ${value} (invalid)`);
}

// background-image: url values
test_light_dark_image(
  "background-image",
  "light-dark(url('light.png'), url('dark.png'))",
  'light.png")',
  'dark.png")'
);

test_light_dark_image(
  "background-image",
  "light-dark(none, url('dark.png'))",
  "none",
  'dark.png")'
);

test_light_dark_image(
  "background-image",
  "light-dark(url('light.png'), none)",
  'light.png")',
  "none"
);

test_light_dark_image(
  "background-image",
  "light-dark(none, none)",
  "none",
  "none"
);

// background-image: gradient values
test_light_dark_image(
  "background-image",
  "light-dark(linear-gradient(red, blue), linear-gradient(green, yellow))",
  "linear-gradient(rgb(255, 0, 0), rgb(0, 0, 255))",
  "linear-gradient(rgb(0, 128, 0), rgb(255, 255, 0))"
);

test_light_dark_image(
  "background-image",
  "light-dark(radial-gradient(red, blue), radial-gradient(green, yellow))",
  "radial-gradient(rgb(255, 0, 0), rgb(0, 0, 255))",
  "radial-gradient(rgb(0, 128, 0), rgb(255, 255, 0))"
);

test_light_dark_image(
  "background-image",
  "light-dark(conic-gradient(red, blue), conic-gradient(green, yellow))",
  "conic-gradient(rgb(255, 0, 0), rgb(0, 0, 255))",
  "conic-gradient(rgb(0, 128, 0), rgb(255, 255, 0))"
);

test_light_dark_image(
  "background-image",
  "light-dark(repeating-linear-gradient(red, blue 50px), repeating-linear-gradient(green, yellow 50px))",
  "repeating-linear-gradient(rgb(255, 0, 0), rgb(0, 0, 255) 50px)",
  "repeating-linear-gradient(rgb(0, 128, 0), rgb(255, 255, 0) 50px)"
);

// background-image: mixed image types (url + gradient)
test_light_dark_image(
  "background-image",
  "light-dark(url('light.png'), linear-gradient(red, blue))",
  'light.png")',
  "linear-gradient(rgb(255, 0, 0), rgb(0, 0, 255))"
);

test_light_dark_image(
  "background-image",
  "light-dark(linear-gradient(red, blue), url('dark.png'))",
  "linear-gradient(rgb(255, 0, 0), rgb(0, 0, 255))",
  'dark.png")'
);

// background-image: none + gradient
test_light_dark_image(
  "background-image",
  "light-dark(none, linear-gradient(red, blue))",
  "none",
  "linear-gradient(rgb(255, 0, 0), rgb(0, 0, 255))"
);

test_light_dark_image(
  "background-image",
  "light-dark(linear-gradient(red, blue), none)",
  "linear-gradient(rgb(255, 0, 0), rgb(0, 0, 255))",
  "none"
);

// list-style-image
test_light_dark_image(
  "list-style-image",
  "light-dark(url('light.png'), url('dark.png'))",
  'light.png")',
  'dark.png")'
);

test_light_dark_image(
  "list-style-image",
  "light-dark(none, url('dark.png'))",
  "none",
  'dark.png")'
);

test_light_dark_image(
  "list-style-image",
  "light-dark(url('light.png'), none)",
  'light.png")',
  "none"
);

// border-image-source
test_light_dark_image(
  "border-image-source",
  "light-dark(url('light.png'), url('dark.png'))",
  'light.png")',
  'dark.png")'
);

test_light_dark_image(
  "border-image-source",
  "light-dark(linear-gradient(red, blue), linear-gradient(green, yellow))",
  "linear-gradient(rgb(255, 0, 0), rgb(0, 0, 255))",
  "linear-gradient(rgb(0, 128, 0), rgb(255, 255, 0))"
);

// content property with image values
test_light_dark_image(
  "content",
  "light-dark(url('light.png'), url('dark.png'))",
  'light.png")',
  'dark.png")'
);

// Nested light-dark with image values
test_light_dark_image(
  "background-image",
  "light-dark(light-dark(url('a.png'), url('b.png')), url('c.png'))",
  'a.png")',
  'c.png")'
);

test_light_dark_image(
  "background-image",
  "light-dark(url('a.png'), light-dark(url('b.png'), url('c.png')))",
  'a.png")',
  'c.png")'
);

test(() => {
  for (let element of [light, dark]) {
    element.style.setProperty("background-image", "");
    element.style.setProperty(
        "background-image",
        "image-set(-webkit-cross-fade(light-dark(url('dummy://light-a.png'), " +
            "url('dummy://dark-a.png')), image-set(light-dark(" +
            "url('dummy://light-b.png'), url('dummy://dark-b.png')) 1x), " +
            "50%) 1x)");
    assert_not_equals(element.style.getPropertyValue("background-image"), "",
                      "Should parse nested image functions");

    const computed = getComputedStyle(element).getPropertyValue(
        "background-image");
    const expected = element.id == "dark"
        ? ["dummy://dark-a.png", "dummy://dark-b.png"]
        : ["dummy://light-a.png", "dummy://light-b.png"];
    const unexpected = element.id == "dark"
        ? ["dummy://light-a.png", "dummy://light-b.png"]
        : ["dummy://dark-a.png", "dummy://dark-b.png"];

    for (const url of expected) {
      assert_true(
          computed.includes(url),
          `Expected "${computed}" to include resolved URL "${url}"`);
    }
    for (const url of unexpected) {
      assert_false(
          computed.includes(url),
          `Expected "${computed}" not to include unresolved URL "${url}"`);
    }

    element.style.setProperty("background-image", "");
  }
}, "background-image: nested image-set() / -webkit-cross-fade() resolve light-dark() at any depth");

// Serialization round-trip
test(() => {
  for (let element of [light, dark]) {
    element.style.setProperty("background-image", "");
    element.style.setProperty("background-image",
      "light-dark(url('light.png'), url('dark.png'))");
    let serialized = element.style.getPropertyValue("background-image");
    assert_not_equals(serialized, "", "Should serialize");
    let computed_before =
        getComputedStyle(element).getPropertyValue("background-image");
    element.style.setProperty("background-image", "");
    element.style.setProperty("background-image", serialized);
    assert_not_equals(element.style.getPropertyValue("background-image"), "",
                      "Serialized value should re-parse");
    let computed_after =
        getComputedStyle(element).getPropertyValue("background-image");
    assert_equals(computed_after, computed_before,
                  "Computed value should match after round-trip");
    element.style.setProperty("background-image", "");
  }
}, "Serialization round-trip for light-dark() image");

// Inheritance: child inherits light-dark image from parent
test(() => {
  const parent = document.getElementById("inherit-parent");
  const child = document.getElementById("inherit-child");
  parent.style.setProperty("background-image",
    "light-dark(url('light.png'), url('dark.png'))");
  child.style.setProperty("background-image", "inherit");
  let computed = getComputedStyle(child).getPropertyValue("background-image");
  assert_true(computed.endsWith('dark.png")'),
              `Expected "${computed}" to end with dark.png")`);
  parent.style.setProperty("background-image", "");
  child.style.setProperty("background-image", "");
}, "Inherited light-dark() image resolves with parent's color-scheme");

// Dynamic color-scheme change
test(() => {
  light.style.setProperty("background-image",
    "light-dark(url('light.png'), url('dark.png'))");
  let computed_light = getComputedStyle(light).getPropertyValue("background-image");
  assert_true(computed_light.endsWith('light.png")'),
              "Should resolve to light image initially");

  light.style.setProperty("color-scheme", "dark");
  let computed_dark = getComputedStyle(light).getPropertyValue("background-image");
  assert_true(computed_dark.endsWith('dark.png")'),
              "Should resolve to dark image after scheme change");

  light.style.setProperty("color-scheme", "light");
  let computed_restored = getComputedStyle(light).getPropertyValue("background-image");
  assert_true(computed_restored.endsWith('light.png")'),
              "Should resolve to light image after restoring scheme");
  light.style.setProperty("background-image", "");
}, "light-dark() image responds to dynamic color-scheme changes");

// Invalid cases
test_invalid("background-image", "light-dark()");
test_invalid("background-image", "light-dark(url(a.png))");
test_invalid("background-image", "light-dark(url(a.png) url(b.png))");
test_invalid("background-image", "light-dark(url(a.png),,url(b.png))");
// Colors are not valid in image context
test_invalid("background-image", "light-dark(red, green)");
test_invalid("background-image", "light-dark(red, url(a.png))");
test_invalid("background-image", "light-dark(url(a.png), red)");
// Three arguments
test_invalid("background-image", "light-dark(url(a.png), url(b.png), url(c.png))");
</script>