preloader-link-media.tentative.html

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This WPT test may be referenced by the following Test IDs:
- /loading/preloader-link-media.tentative.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

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

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

<script src="resources/dummy.js?pipe=trickle(d1)"></script>

<link rel="stylesheet" media="print" href="resources/dummy.css?print">

<link rel="stylesheet" href="resources/dummy.css?non-print">

<script>

  let t = async_test("Non-matching link media is not preloaded");

  window.addEventListener("load", t.step_func_done(function() {

    let entries = performance.getEntriesByType('resource');

    let found_print = null;

    let found_non_print = null;

    for (let entry of entries) {

      if (entry.name.includes("?print")) {

        assert_equals(found_print, null);

        found_print = entry.startTime;

      if (entry.name.includes("?non-print")) {

        assert_equals(found_non_print, null);

        found_non_print = entry.startTime;

    assert_not_equals(found_print, null, "Should've loaded print sheet");

    assert_not_equals(found_non_print, null, "Should've loaded non-print sheet");

    // We can assert_greater_than (rather than greater_than_equal) because if

    // the non-print sheet has been preloaded but the print one hasn't, we have

    // the trickle mechanism to try to guarantee that enough time has passed

    // between one load and the next.

    assert_greater_than(found_print, found_non_print, "Non-print sheet should've started loading before print sheet")

  }));

</script>