decoded-body-size-compressed.https.html

<!DOCTYPE html>

<html>

<head>

  <meta charset="utf-8">

  <meta name="timeout" content="long"/>

  <title>PerformanceResourceTiming.decodedBodySize for compressed resources</title>

  <link rel="help" href="https://www.w3.org/TR/resource-timing-2/#dom-performanceresourcetiming-decodedbodysize" />

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

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

  <script src="/fetch/compression-dictionary/resources/compression-dictionary-util.sub.js"></script>

  <script>

    const waitForResourceTiming = (url) => {

      return new Promise(resolve => {

        const observer = new PerformanceObserver((list) => {

          const entries = list.getEntries();

          for (const entry of entries) {

            if (entry.name.includes(url)) {

              observer.disconnect();

              resolve(entry);

});

        observer.observe({ entryTypes: ["resource"] });

});

};

    promise_test(async (t) => {

      const url = "/resource-timing/resources/gzip_xml.py";

      const expectedDecodedSize = 125;

      const timingPromise = waitForResourceTiming(url);

      const response = await fetch(url);

      await response.text();

      const entry = await timingPromise;

      assert_equals(entry.decodedBodySize, expectedDecodedSize,

        "decodedBodySize should match the uncompressed XML file size");

      assert_greater_than(entry.encodedBodySize, 0,

        "encodedBodySize should be non-zero");

    }, "decodedBodySize for gzip-compressed XML resource");

    promise_test(async (t) => {

      const url = "/resource-timing/resources/foo.text.br";

      const expectedDecodedSize = 10500;

      const expectedEncodedSize = 15;

      const timingPromise = waitForResourceTiming(url);

      const response = await fetch(url);

      await response.text();

      const entry = await timingPromise;

      assert_equals(entry.decodedBodySize, expectedDecodedSize,

        "decodedBodySize should match the uncompressed brotli file size");

      assert_equals(entry.encodedBodySize, expectedEncodedSize,

        "encodedBodySize should match the compressed brotli file size");

    }, "decodedBodySize for brotli-compressed text resource");

    promise_test(async (t) => {

      const url = "/resource-timing/resources/foo.text.gz";

      const expectedDecodedSize = 10500;

      const expectedEncodedSize = 57;

      const timingPromise = waitForResourceTiming(url);

      const response = await fetch(url);

      await response.text();

      const entry = await timingPromise;

      assert_equals(entry.decodedBodySize, expectedDecodedSize,

        "decodedBodySize should match the uncompressed gzip file size");

      assert_equals(entry.encodedBodySize, expectedEncodedSize,

        "encodedBodySize should match the compressed gzip file size");

    }, "decodedBodySize for gzip-compressed text resource");

    promise_test(async (t) => {

      const url = "/resource-timing/resources/compressed-js.py?content_encoding=gzip";

      const expectedDecodedSize = 53;

      const timingPromise = waitForResourceTiming(url);

      const response = await fetch(url);

      await response.text();

      const entry = await timingPromise;

      assert_equals(entry.decodedBodySize, expectedDecodedSize,

        "decodedBodySize should match the uncompressed JS file size");

      assert_not_equals(entry.encodedBodySize, entry.decodedBodySize,

        "encodedBodySize should differ from decodedBodySize for gzip-compressed JS");

      assert_greater_than(entry.encodedBodySize, 0,

        "encodedBodySize should be non-zero");

    }, "decodedBodySize for dynamically gzip-compressed JS resource");

    promise_test(async (t) => {

      const url = "/resource-timing/resources/compressed-js.py?content_encoding=deflate";

      const expectedDecodedSize = 53;

      const timingPromise = waitForResourceTiming(url);

      const response = await fetch(url);

      await response.text();

      const entry = await timingPromise;

      assert_equals(entry.decodedBodySize, expectedDecodedSize,

        "decodedBodySize should match the uncompressed JS file size");

      assert_not_equals(entry.encodedBodySize, entry.decodedBodySize,

        "encodedBodySize should differ from decodedBodySize for deflate-compressed JS");

      assert_greater_than(entry.encodedBodySize, 0,

        "encodedBodySize should be non-zero");

    }, "decodedBodySize for deflate-compressed JS resource");

    promise_test(async (t) => {

      const url = "/resource-timing/resources/compressed-js.py?content_encoding=identity";

      const expectedSize = 53;

      const timingPromise = waitForResourceTiming(url);

      const response = await fetch(url);

      await response.text();

      const entry = await timingPromise;

      assert_equals(entry.decodedBodySize, expectedSize,

        "decodedBodySize should match file size for uncompressed resource");

      assert_equals(entry.encodedBodySize, expectedSize,

        "encodedBodySize should equal decodedBodySize for uncompressed resource");

    }, "decodedBodySize equals encodedBodySize for uncompressed resource");

    compression_dictionary_promise_test(async (t) => {

      const registerDictionaryUrl = '/fetch/compression-dictionary/resources/register-dictionary.py';

      const compressedDataUrl = '/fetch/compression-dictionary/resources/compressed-data.py';

      const dict = await (await fetch(registerDictionaryUrl)).text();

      assert_equals(dict, kDefaultDictionaryContent);

      await new Promise(resolve => t.step_timeout(resolve, 500));

      const url = `${compressedDataUrl}?content_encoding=dcb`;

      const expectedDecodedSize = 52;

      const expectedEncodedSize = 75;

      const timingPromise = waitForResourceTiming(url);

      const response = await fetch(url);

      const text = await response.text();

      assert_equals(text, kExpectedCompressedData,

        "The resource should decompress correctly");

      const entry = await timingPromise;

      assert_equals(entry.decodedBodySize, expectedDecodedSize,

        "decodedBodySize should match the uncompressed data size (52 bytes)");

      assert_equals(entry.encodedBodySize, expectedEncodedSize,

        "encodedBodySize should match the dictionary-compressed brotli size (75 bytes including dictionary hash)");

    }, "decodedBodySize for dictionary-compressed brotli (dcb) resource");

    compression_dictionary_promise_test(async (t) => {

      const registerDictionaryUrl = '/fetch/compression-dictionary/resources/register-dictionary.py';

      const compressedDataUrl = '/fetch/compression-dictionary/resources/compressed-data.py';

      const dict = await (await fetch(registerDictionaryUrl)).text();

      assert_equals(dict, kDefaultDictionaryContent);

      await new Promise(resolve => t.step_timeout(resolve, 500));

      const url = `${compressedDataUrl}?content_encoding=dcz`;

      const expectedDecodedSize = 52;

      const expectedEncodedSize = 83;

      const timingPromise = waitForResourceTiming(url);

      const response = await fetch(url);

      const text = await response.text();

      assert_equals(text, kExpectedCompressedData,

        "The resource should decompress correctly");

      const entry = await timingPromise;

      assert_equals(entry.decodedBodySize, expectedDecodedSize,

        "decodedBodySize should match the uncompressed data size (52 bytes)");

      assert_equals(entry.encodedBodySize, expectedEncodedSize,

        "encodedBodySize should match the dictionary-compressed zstd size (83 bytes including dictionary hash)");

    }, "decodedBodySize for dictionary-compressed zstd (dcz) resource");

  </script>

</head>

<body>

  <h1>Description</h1>

<p>

    This test validates that PerformanceResourceTiming.decodedBodySize correctly reports

    the size of resources after removing content encoding (gzip, brotli, deflate, and

    compression dictionaries with dcb and dcz), and that it differs from encodedBodySize

    for compressed resources.

  </p>

</body>

</html>