<!DOCTYPE html>
<title>CSS Cascade Test: import conditions</title>
<link rel="help" href="https://www.w3.org/TR/css-cascade-5/#import-conditions">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  @layer {
    .target { color: red; }
  }
</style>
<div id="target" class="target"></div>
<script>
  const testCases = [
    {
      importCondition: "supports(display:block)",
      matches: true
    },
    {
      importCondition: "supports((display:flex))",
      matches: true
    },
    {
      importCondition: "supports((display:block) and (display:flex))",
      matches: true
    },
    {
      importCondition: "supports((display:block) and (foo:bar))",
      matches: false
    },
    {
      importCondition: "supports((display:block) or (display:flex))",
      matches: true
    },
    {
      importCondition: "supports((display:block) or (foo:bar))",
      matches: true
    },
    {
      importCondition: "supports(not (display: flex))",
      matches: false
    },
    {
      importCondition: "supports(display: block !important)",
      matches: true
    },
    {
      importCondition: "supports(foo:bar)",
      matches: false
    },
    {
      importCondition: "supports(display:block) (width >= 0px)",
      matches: true
    },
    {
      importCondition: "(width >= 0px) supports(foo:bar)",
      matches: false
    },
    {
      importCondition: "(width >= 0px) supports(display:block)",
      matches: false
    },

    // selector()
    {
      importCondition: "supports(selector(a))",
      matches: true
    },
    {
      importCondition: "supports(selector(p a))",
      matches: true
    },
    {
      importCondition: "supports(selector(p > a))",
      matches: true
    },
    {
      importCondition: "supports(selector(p + a))",
      matches: true
    },

    // font-tech()
    {
      importCondition: "supports(font-tech(color-COLRv1))",
      matches: true
    },
    {
      importCondition: "supports(font-tech(invalid))",
      matches: false
    },

    // font-format()
    {
      importCondition: "supports(font-format(opentype))",
      matches: true
    },
    {
      importCondition: "supports(font-format(woff))",
      matches: true
    },
    {
      importCondition: "supports(font-format(invalid))",
      matches: false
    },
    {
      importCondition: "layer(A.B) supports(font-format(opentype))",
      matches: true
    },
    {
      importCondition: "layer supports(selector(a))",
      matches: true
    },
  ];
  let target = document.getElementById("target");
  for (let testCase of testCases) {
    promise_test(async t => {
      let styleElement = document.createElement("style");
      styleElement.innerText = "@import url(data:text/css,.target{color:green}) " + testCase.importCondition + ";";

      await new Promise(resolve => {
        styleElement.onload = resolve;
        styleElement.onerror = resolve;
        document.head.appendChild(styleElement);
      });

      try {
        assert_equals(getComputedStyle(target).color, testCase.matches ? "rgb(0, 128, 0)" : "rgb(255, 0, 0)");
      } finally {
        styleElement.remove();
      }
    }, testCase.importCondition + " is " + (testCase.matches ? "" : "not ")  + "a valid import condition");
  }
</script>
