File: import-css-module-dynamic.html

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<!doctype html>

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

<body>
    <script>
        promise_test(async function (test) {
            const css_module = await import("./resources/basic.css", { assert: { type: "css" }});
            assert_true(css_module.default instanceof CSSStyleSheet);
            assert_equals(css_module.default.cssRules[0].cssText,
                "#test { background-color: rgb(255, 0, 0); }");
        }, "Load a CSS module with dynamic import()");

        promise_test(function (test) {
            return promise_rejects_js(test, TypeError,
                import("./resources/basic.css"),
                "Attempting to import() a CSS module without a type assertion should fail");
        }, "Ensure that loading a CSS module with dymnamic import() fails without a type assertion");
    </script>
</body>