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products/sources/formale Sprachen/C/Firefox/layout/style/test/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 6 kB

Quellcode-Bibliothek test_load_events_on_stylesheets.html Sprache: HTML

products/sources/formale Sprachen/C/Firefox/layout/style/test/test_load_events_on_stylesheets.html

<!DOCTYPE HTML>
<html>

<head>
  <title>Test for Bug 185236</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  <script>
    var pendingEventCounter = 0;
    SimpleTest.waitForExplicitFinish();
    addLoadEvent(function() {
      is(pendingEventCounter, 0,
         "How did onload for the page fire before onload for all the stylesheets?");
      SimpleTest.finish();
    });
    // Count the link we're about to parse
    pendingEventCounter = 1;
  </script>
  <link rel="stylesheet" href="data:text/css,*{}"
        onload="--pendingEventCounter;
                ok(true, 'Load event firing on basic stylesheet')"
        onerror="--pendingEventCounter;
                 ok(false, 'Error event firing on basic stylesheet')">
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=185236">Mozilla Bug 185236</a>
<p id="display"></p>
<div id="content" style="display: none">

</div>
<pre id="test">
<script>
/** Test for Bug 185236 **/

function checkSheetComplete(sheet, length) {
  try {
    is(sheet.cssRules.length, length, `Should be loaded with ${length} rule(s)`);
  } catch (e) {
    ok(false, "Sheet has not been loaded completely");
  }
}

// There should be usually 1 pending event but the load event might have fired
// if the parser yields between the link and starting the script execution.
const pendingEventCounterAtStart = pendingEventCounter;

ok(pendingEventCounter <= 1, `There should be at most one pending event, got ${pendingEventCounterAtStart}`);

is(document.styleSheets.length, 2, "Should have two stylesheets");
checkSheetComplete(document.styleSheets[1], 1);

// Test sheet that will already be complete when we write it out
++pendingEventCounter;
document.write('
                onload="--pendingEventCounter;\
                        ok(true, \'Load event firing on basic stylesheet\')"\
                onerror="--pendingEventCounter;\
                        ok(false, \'Error event firing on basic stylesheet\')">');

// Make sure we have that second stylesheet
is(document.styleSheets.length, 3, "Should have three stylesheets");

// Make sure that the second stylesheet is all loaded
// If we ever switch away from sync loading of already-complete sheets, this
// test will need adjusting
checkSheetComplete(document.styleSheets[2], 1);

// Make sure the load event for that stylesheet has not fired yet
is(pendingEventCounter, pendingEventCounterAtStart + 1, "After first document write");
++pendingEventCounter;

document.write('
                onload="--pendingEventCounter;\
                        ok(true, \'Load event firing on inline stylesheet\')"\
                onerror="--pendingEventCounter;\
                        ok(false, \'Error event firing on inline stylesheet\')">');

// Make sure the load event for that second stylesheet has not fired yet
is(pendingEventCounter, pendingEventCounterAtStart + 2, "after second document write");
++pendingEventCounter;

document.write('
                onload="--pendingEventCounter;\
                        ok(false, \'Load event firing on broken stylesheet 1\')"\
                onerror="--pendingEventCounter;\
                        ok(true, \'Error event firing on broken stylesheet 1\')">');
++pendingEventCounter;

var link = document.createElement("link");
link.rel = "stylesheet";
link.href = "http://www.example.com";
link.onload = function() { --pendingEventCounter;
  ok(false, 'Load event firing on broken stylesheet 2');
};
link.onerror = function() { --pendingEventCounter;
  ok(true, 'Error event firing on broken stylesheet 2');
}
document.body.appendChild(link);

++pendingEventCounter;
link = document.createElement("link");
link.rel = "stylesheet";
link.href = "data:text/css,*{}";
link.onload = function() { --pendingEventCounter;
  ok(true, 'Load event firing on external stylesheet');
};
link.onerror = function() { --pendingEventCounter;
  ok(false, 'Error event firing on external stylesheet');
}
document.body.appendChild(link);

// If we ever switch away from sync loading of already-complete sheets, this
// test will need adjusting
checkSheetComplete(link.sheet, 1);

++pendingEventCounter;
link = document.createElement("link");
link.rel = "stylesheet";
link.href = "data:text/css,@import url('data:text/css,*{}')";
link.onload = function() { --pendingEventCounter;
  ok(true, 'Load event firing on external stylesheet');
};
link.onerror = function() { --pendingEventCounter;
  ok(false, 'Error event firing on external stylesheet');
}
document.body.appendChild(link);

++pendingEventCounter;
link = document.createElement("link");
link.rel = "stylesheet";
link.href = "data:text/css,@import url('http://www.example.com')";
link.onload = function() { --pendingEventCounter;
  ok(false, 'Load event firing on broken stylesheet 3');
};
link.onerror = function() { --pendingEventCounter;
  ok(true, 'Error event firing on broken stylesheet 3');
}
document.body.appendChild(link);

function absoluteURL(relativeURL) {
  return new URL(relativeURL, location.href).href;
}

++pendingEventCounter;
link = document.createElement("link");
link.rel = "stylesheet";
link.href = `data:text/css,@import url('http://www.example.com'); @import url(${absoluteURL('slow_ok_sheet.sjs')});`;
link.onload = function() { --pendingEventCounter;
  ok(false, 'Load event firing on broken stylesheet 4');
};
link.onerror = function() { --pendingEventCounter;
  ok(true, 'Error event firing on broken stylesheet 4');
}
document.body.appendChild(link);

++pendingEventCounter;
link = document.createElement("link");
link.rel = "stylesheet";
link.href = `data:text/css,@import url(${absoluteURL('slow_broken_sheet.sjs')}); @import url('data:text/css,');`;
link.onload = function() { --pendingEventCounter;
  ok(false, 'Load event firing on broken stylesheet 5');
};
link.onerror = function() { --pendingEventCounter;
  ok(true, 'Error event firing on broken stylesheet 5');
}
document.body.appendChild(link);

// Make sure the load events for all those stylesheets have not fired yet
is(pendingEventCounter, pendingEventCounterAtStart + 9, "There should be nine more pending events");
</script>
</pre>
</body>
</html>

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