Gedichte Musik Bilder Quellcodebibliothek Diashow Normaldarstellung
Quellcodebibliothek Statistik Leitseite products/Sources/formale Sprachen/C/Firefox/dom/tests/mochitest/general/   (Browser von der Mozilla Stiftung Version 136.0.1©)  Datei vom 10.2.2025 mit Größe 8 kB image not shown  

Quelle  test_img_mutations.html   Sprache: HTML

 
 products/Sources/formale Sprachen/C/Firefox/dom/tests/mochitest/general/test_img_mutations.html


<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title>Image srcset mutations</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
  <script type="application/javascript">
    "use strict";

    // Tests the relevant mutations part of the spec for img src and srcset
    // and that img.src still behaves by the older spec. (Bug 1076583)
    // https:// style='color:red'>html.spec.whatwg.org/#relevant-mutations
    SimpleTest.waitForExplicitFinish();

    // 50x50 png
    var testPNG50 = new URL("image_50.png?noCache=" + Math.random(), location).href;
    // 100x100 png
    var testPNG100 = new URL("image_100.png?noCache=" + Math.random(), location).href;
    // 200x200 png
    var testPNG200 = new URL("image_200.png?noCache=" + Math.random(), location).href;

    var tests = [];
    var img;
    var expectingErrors = 0;
    var expectingLoads = 0;
    var afterExpectCallback;

    function onImgLoad() {
      ok(expectingLoads > 0, "expected load");
      if (expectingLoads > 0) {
        expectingLoads--;
      }
      if (!expectingLoads && !expectingErrors && afterExpectCallback) {
        setTimeout(afterExpectCallback, 0);
        afterExpectCallback = null;
      }
    }
    function onImgError() {
      ok(expectingErrors > 0, "expected error");
      if (expectingErrors > 0) {
        expectingErrors--;
      }
      if (!expectingLoads && !expectingErrors && afterExpectCallback) {
        setTimeout(afterExpectCallback, 0);
        afterExpectCallback = null;
      }
    }
    function expectEvents(loads, errors, callback) {
      let p = new Promise(resolve => {
        if (!loads && !errors) {
          setTimeout(resolve, 0);
        } else {
          expectingLoads += loads;
          expectingErrors += errors;
          info("Waiting for " + expectingLoads + " load and " + expectingErrors + " error events");
          afterExpectCallback = resolve;
        }
      });
      return p.then(() => callback && callback());
    }

    //
    // Test that img.src still does some work synchronously per the older spec (bug 1076583)
    //
    tests.push(async function test1() {
      info("test 1");
      img.src = testPNG50;
      is(img.currentSrc, "", "Should not have synchronously selected source");

      await expectEvents(1, 0);
      is(img.currentSrc, testPNG50, "Should now have testPNG50 as current request");

      // Assigning a wrong URL should not trigger error event (bug 1321300).
      img.src = '//:0'; // Wrong URL
      is(img.currentSrc, "", "Should have dropped current request sync");

      img.src = "non_existent_image.404";
      is(img.currentSrc, "", "Should still have empty current request");

      await expectEvents(0, 1);
      ok(img.currentSrc.endsWith("non_existent_image.404"), "Should have asynchronously selected source");

      img.removeAttribute("src");
      is(img.currentSrc, "", "Should have dropped currentSrc sync");

      // Load another image while previous load is still pending
      img.src = testPNG200;
      is(img.currentSrc, "", "Should asynchronously load selected source");

      await expectEvents(1, 0);
      is(img.currentSrc, testPNG200, "Should have asynchronously loaded selected source");
      nextTest();
    });


    // Setting srcset should be async
    tests.push(function () {
      info("test 2");
      img.srcset = testPNG100;
      is(img.currentSrc, testPNG200, "Should still have testPNG200 as current request");

      expectEvents(1, 0, function() {
        is(img.currentSrc, testPNG100, "Should now have testPNG100 as current request");
        nextTest();
      });
    });

    // Setting srcset, even to no ultimate effect, should trigger a reload
    tests.push(function () {
      info("test 3");
      img.srcset = testPNG100 + " 1x, " + testPNG200 + " 2x";
      is(img.currentSrc, testPNG100, "Should still have testPNG100 as current request");

      expectEvents(1, 0, function() {
        is(img.currentSrc, testPNG100, "Should still have testPNG100 as current request");
        nextTest();
      });
    });

    // Should switch to src as 1x source
    tests.push(function () {
      info("test 4");
      img.srcset = testPNG50 + " 2x";
      is(img.currentSrc, testPNG100, "Should still have testPNG100 as current request");

      expectEvents(1, 0, function() {
        is(img.currentSrc, testPNG200, "Should now have testPNG200 as current request");
        nextTest();
      });
    });

    // Changing src while we have responsive attributes should not be sync
    tests.push(function () {
      info("test 5");
      img.src = testPNG100;
      is(img.currentSrc, testPNG200, "Should still have testPNG200 as current request");

      expectEvents(1, 0, function() {
        is(img.currentSrc, testPNG100, "Should now have testPNG100 as current request");

        // Switch to using srcset again for next test
        img.srcset = testPNG100;
        expectEvents(1, 0, nextTest);
      });
    });

    // img.src = img.src should trigger an async event even in responsive mode
    tests.push(function () {
      info("test 6");
      is(img.currentSrc, testPNG100, "Should now have testPNG100 as current request");
      // eslint-disable-next-line no-self-assign
      img.src = img.src;
      is(img.currentSrc, testPNG100, "Should still have testPNG100 as current request");

      expectEvents(1, 0, nextTest);
    });

    // img.srcset = img.srcset should be a no-op
    tests.push(function () {
      info("test 7");
      // eslint-disable-next-line no-self-assign
      img.srcset = img.srcset;
      is(img.currentSrc, testPNG100, "Should still have testPNG100 as current request");

      expectEvents(0, 0, nextTest);
    });

    // re-binding the image to the document should be a no-op
    tests.push(function () {
      info("test 8");
      document.body.appendChild(img);
      is(img.currentSrc, testPNG100, "Should still have testPNG100 as current request");

      expectEvents(0, 0, nextTest);
    });

    // We should re-run our selection algorithm when any load event occurs
    tests.push(function () {
      info("test 9");
      img.srcset = testPNG50 + " 1x, " + testPNG200 + " 2x";
      is(img.currentSrc, testPNG100, "Should still have testPNG100 as current request");

      expectEvents(1, 0, function() {
        is(img.currentSrc, testPNG50, "Should now have testPNG50 as current request");

        // The preference change will trigger a load, as the image will change
        SpecialPowers.pushPrefEnv({'set': [ ["layout.css.devPixelsPerPx", "2.0"] ] });
        expectEvents(1, 0, function() {
          is(img.currentSrc, testPNG200, "Should now have testPNG200 as current request");
          // eslint-disable-next-line no-self-assign
          img.src = img.src;
          is(img.currentSrc, testPNG200, "Should still have testPNG200 as current request");
          // img.src = img.src is special-cased by the spec. It should always
          // trigger an load event
          expectEvents(1, 0, function() {
            is(img.currentSrc, testPNG200, "Should still have testPNG200 as current request");
            expectEvents(0, 0, nextTest);
          });
        })
      });
    });

    // Removing srcset attr should async switch back to src
    tests.push(async function () {
      info("test 10");
      is(img.currentSrc, testPNG200, "Should have testPNG200 as current request");

      img.removeAttribute("srcset");
      is(img.currentSrc, testPNG100, "Should testPNG100 as current request (hits sync load case for src)");

      await expectEvents(1, 0);
      is(img.currentSrc, testPNG100, "Should now have testPNG100 as current request");

      expectEvents(0, 0, nextTest);
    });

    function nextTest() {
      if (tests.length) {
        // Spin event loop to make sure no unexpected image events are
        // pending (unexpected events will assert in the handlers)
        setTimeout(async function() {
          await (tests.shift())();
        }, 0);
      } else {
        // Remove the event listeners to prevent the prefenv being popped from
        // causing test failures.
        img.removeEventListener("load", onImgLoad);
        img.removeEventListener("error", onImgError);
        SimpleTest.finish();
      }
    }

    addEventListener("load", function() {
      SpecialPowers.pushPrefEnv({'set': [["layout.css.devPixelsPerPx", "1.0"]] },
                                function() {
        // Create this after the pref is set, as it is guarding webIDL attributes
        img = document.createElement("img");
        img.addEventListener("load", onImgLoad);
        img.addEventListener("error", onImgError);
        document.body.appendChild(img);
        setTimeout(nextTest, 0);
      });
    });
  </script>
</body>
</html>

¤ Dauer der Verarbeitung: 0.24 Sekunden  (vorverarbeitet)  ¤

*© Formatika GbR, Deutschland




Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.