import-css-module-basic.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/scripting-1/the-script-element/css-module/import-css-module-basic.html - WPT Dashboard Interop Dashboard

<!doctype html>

<head>

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

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

</head>

<body>

    <div id="test">I am a test div.</div>

    <div id="test2">I am a test div.</div>

    <div id="test3">I am a test div.</div>

    <div id="test3b">I am a test div.</div>

    <div id="test4">I am a test div.</div>

    <div id="test4b">I am a test div.</div>

    <script>

        window.errorCount = 0;

        window.onerror = (errorMsg, url, lineNumber, column, errorObj) => {

            window.errorCount++;

};

    </script>

    <script type="module" onerror="unreachable()">

        import sheet from "./resources/basic.css" with { type: "css" };

        test(() => {

            document.adoptedStyleSheets = [...document.adoptedStyleSheets, sheet];

            assert_equals(getComputedStyle(document.querySelector('#test'))

                    .backgroundColor, "rgb(255, 0, 0)", "CSS module import should succeed");

        }, "A CSS Module should load");

    </script>

    <script type="module" onerror="unreachable()">

        import sheet from "./resources/basic-large.css" with { type: "css" };

        test(() => {

            // This tests potential streaming compilation of modules in

            // Chromium that is triggered only for large (32>KiB) files in older

            // versions.

            document.adoptedStyleSheets = [...document.adoptedStyleSheets, sheet];

            assert_equals(getComputedStyle(document.querySelector('#test2'))

                    .backgroundColor, "rgb(255, 0, 0)",

                    "CSS module import should succeed");

        }, "A large CSS Module should load");

    </script>

    <script type="module" onerror="unreachable()">

        import sheet from "./resources/bad-import.css" with { type: "css" };

        test(() => {

            document.adoptedStyleSheets = [...document.adoptedStyleSheets, sheet];

            assert_equals(window.errorCount, 0);

            assert_equals(sheet.cssRules.length, 1, "Parser should skip @import rule");

            assert_equals(getComputedStyle(document.querySelector('#test3b'))

                .backgroundColor, "rgba(0, 0, 0, 0)",

                "CSS module @import should not succeed");

            assert_equals(getComputedStyle(document.querySelector('#test3'))

                .backgroundColor, "rgb(0, 255, 0)",

                "Rule after @import should still be applied");

        }, "An @import CSS Module should not load, but should not throw an exception");

    </script>

    <script type="module" onerror="unreachable()">

        import sheet from "./resources/malformed.css" with { type: "css" };

        test(() => {

            document.adoptedStyleSheets = [...document.adoptedStyleSheets, sheet];

            assert_equals(window.errorCount, 0);

            assert_equals(sheet.cssRules.length, 1, "Import of malformed CSS should succeed and rules after the parse error should still be parsed");

            assert_equals(getComputedStyle(document.querySelector('#test4'))

                .backgroundColor, "rgba(0, 0, 0, 0)",

                "Malformed CSS rule should not be applied");

            assert_equals(getComputedStyle(document.querySelector('#test4b'))

                .backgroundColor, "rgb(0, 255, 0)",

                "Parsing should recover and rules after malformed rules should be applied");

        }, "A parse error should not prevent subsequent rules from being included in a CSS module");

    </script>

    <script type="module">

        promise_test(function (test) {

            const iframe = document.createElement("iframe");

            iframe.src = "resources/css-module-without-attribute-iframe.html";

            return new Promise(resolve => {

                iframe.onload = resolve;

                document.body.appendChild(iframe);

            }).then(event => {

                assert_equals(iframe.contentDocument.window_onerror, undefined);

                assert_equals(iframe.contentDocument.script_onerror.type, "error");

                assert_equals(getComputedStyle(iframe.contentDocument.querySelector('#test'))

                    .backgroundColor, "rgba(0, 0, 0, 0)",

                    "CSS module without type attribute should result in a fetch error");

});

        }, "CSS module without type attribute should result in a fetch error");

    </script>

</body>