LazyLoad: Add external web platform tests for the lazyload attribute.

This CL includes tests for: - testing that images and iframes with the attribute lazyload="off" are loaded immediately - testing that images and iframes with other lazyload attribute values are loaded immediately when the attribute value is changed to "off" - testing that having images and iframes below the viewport with different lazyload attribute values doesn't endlessly block the window load event - testing that images and iframes with different lazyload attribute values that enter the viewport are loaded. Bug: 916260 Change-Id: I323faa31c7683663d0d0136a719cf83c25758ad6
web-platform-tests · Jun 21, 2019 · 3b29d61 · 3b29d61
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diff --git a/loading/lazyload/attribute_off_iframe.tentative.sub.html b/loading/lazyload/attribute_off_iframe.tentative.sub.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<head>
+  <title>Loading iframes with lazyload="off"</title>
+  <link rel="author" title="Scott Little" href="mailto:[email protected]">
+  <link rel="help" href="https://github.com/whatwg/html/pull/3752">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<!--
+Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
+-->
+
+<body>
+  <iframe id="in_viewport" src="https://{{hosts[][www]}}:{{ports[https][0]}}/loading/lazyload/resources/subframe_1.html" width="200px" height="100px" lazyload="off"></iframe>
+  <div style="height:10000px;"></div>
+  <iframe id="below_viewport" src="https://{{hosts[][www]}}:{{ports[https][0]}}/loading/lazyload/resources/subframe_2.html" width="200px" height="100px" lazyload="off"></iframe>
+</body>
+
+<script>
+  var t = async_test("Test that both iframes load immediately and block the window's load event.");
+
+  var has_in_viewport_iframe_loaded = false;
+  document.getElementById("in_viewport").addEventListener("load",
+    t.step_func(function() {
+      assert_false(has_in_viewport_iframe_loaded);
+      has_in_viewport_iframe_loaded = true;
+    }));
+
+  var has_below_viewport_iframe_loaded = false;
+  document.getElementById("below_viewport").addEventListener("load",
+    t.step_func(function() {
+      assert_false(has_below_viewport_iframe_loaded);
+      has_below_viewport_iframe_loaded = true;
+    }));
+
+  window.addEventListener("load", t.step_func_done(function() {
+    assert_true(has_in_viewport_iframe_loaded);
+    assert_true(has_below_viewport_iframe_loaded);
+  }));
+</script>
diff --git a/loading/lazyload/attribute_off_image.tentative.html b/loading/lazyload/attribute_off_image.tentative.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<head>
+  <title>Loading images with lazyload="off"</title>
+  <link rel="author" title="Scott Little" href="mailto:[email protected]">
+  <link rel="help" href="https://github.com/whatwg/html/pull/3752">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<!--
+Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
+-->
+
+<body>
+  <img id="in_viewport" src="resources/image_1.png" lazyload="off">
+  <div style="height:10000px;"></div>
+  <img id="below_viewport" src="resources/image_2.png" lazyload="off">
+</body>
+
+<script>
+  var t = async_test("Test that both images load immediately and block the window's load event.");
+
+  var has_in_viewport_image_loaded = false;
+  document.getElementById("in_viewport").addEventListener("load",
+    t.step_func(function() {
+      assert_false(has_in_viewport_image_loaded);
+      has_in_viewport_image_loaded = true;
+    }));
+
+  var has_below_viewport_image_loaded = false;
+  document.getElementById("below_viewport").addEventListener("load",
+    t.step_func(function() {
+      assert_false(has_below_viewport_image_loaded);
+      has_below_viewport_image_loaded = true;
+    }));
+
+  window.addEventListener("load", t.step_func_done(function() {
+    assert_true(has_in_viewport_image_loaded);
+    assert_true(has_below_viewport_image_loaded);
+  }));
+</script>
diff --git a/loading/lazyload/change_attribute_to_off_iframe.tentative.sub.html b/loading/lazyload/change_attribute_to_off_iframe.tentative.sub.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<head>
+  <title>Iframes load immediately when lazyload attribute is changed to "off"</title>
+  <link rel="author" title="Scott Little" href="mailto:[email protected]">
+  <link rel="help" href="https://github.com/whatwg/html/pull/3752">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<!--
+Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
+-->
+
+<body>
+  <div style="height:10000px;"></div>
+  <iframe id="attribute_unset" src="https://{{hosts[][www]}}:{{ports[https][0]}}/loading/lazyload/resources/subframe_1.html" width="200px" height="100px"></iframe>
+  <iframe id="attribute_invalid" src="https://{{hosts[][www]}}:{{ports[https][0]}}/loading/lazyload/resources/subframe_2.html" width="200px" height="100px" lazyload="invalid_value"></iframe>
+  <iframe id="attribute_auto" src="https://{{hosts[][www]}}:{{ports[https][0]}}/loading/lazyload/resources/subframe_3.html" width="200px" height="100px" lazyload="auto"></iframe>
+  <iframe id="attribute_on" src="https://{{hosts[][www]}}:{{ports[https][0]}}/loading/lazyload/resources/subframe_4.html" width="200px" height="100px" lazyload="on"></iframe>
+</body>
+
+<script>
+  var t = async_test("Test that below viewport iframes that have their lazyload attributes changed to off are loaded.");
+
+  var has_attribute_unset_loaded = false;
+  var has_attribute_invalid_loaded = false;
+  var has_attribute_auto_loaded = false;
+  var has_attribute_on_loaded = false;
+
+  function checkIfDone() {
+    if (has_attribute_unset_loaded &&
+        has_attribute_invalid_loaded &&
+        has_attribute_auto_loaded &&
+        has_attribute_on_loaded) {
+      t.done();
+    }
+  }
+
+  document.getElementById("attribute_unset").addEventListener("load", t.step_func(function() {
+    assert_false(has_attribute_unset_loaded);
+    has_attribute_unset_loaded = true;
+    checkIfDone();
+  }));
+  document.getElementById("attribute_invalid").addEventListener("load", t.step_func(function() {
+    assert_false(has_attribute_invalid_loaded);
+    has_attribute_invalid_loaded = true;
+    checkIfDone();
+  }));
+  document.getElementById("attribute_auto").addEventListener("load", t.step_func(function() {
+    assert_false(has_attribute_auto_loaded);
+    has_attribute_auto_loaded = true;
+    checkIfDone();
+  }));
+  document.getElementById("attribute_on").addEventListener("load", t.step_func(function() {
+    assert_false(has_attribute_on_loaded);
+    has_attribute_on_loaded = true;
+    checkIfDone();
+  }));
+
+  window.addEventListener("load", t.step_func_done(function() {
+    document.getElementById("attribute_unset").setAttribute("lazyload", "off");
+    document.getElementById("attribute_invalid").setAttribute("lazyload", "off");
+    document.getElementById("attribute_auto").setAttribute("lazyload", "off");
+    document.getElementById("attribute_on").setAttribute("lazyload", "off");
+  }));
+</script>
diff --git a/loading/lazyload/change_attribute_to_off_image.tentative.html b/loading/lazyload/change_attribute_to_off_image.tentative.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<head>
+  <title>Images load immediately when lazyload attribute is changed to "off"</title>
+  <link rel="author" title="Scott Little" href="mailto:[email protected]">
+  <link rel="help" href="https://github.com/whatwg/html/pull/3752">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<!--
+Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
+-->
+
+<body>
+  <div style="height:10000px;"></div>
+  <img id="attribute_unset" src="resources/image_1.png">
+  <img id="attribute_invalid" src="resources/image_2.png" lazyload="invalid_value">
+  <img id="attribute_auto" src="resources/image_3.png" lazyload="auto">
+  <img id="attribute_on" src="resources/image_4.png" lazyload="on">
+</body>
+
+<script>
+  var t = async_test("Test that a below viewport image that has its lazyload attribute changed to off is loaded.");
+
+  var has_attribute_unset_loaded = false;
+  var has_attribute_invalid_loaded = false;
+  var has_attribute_auto_loaded = false;
+  var has_attribute_on_loaded = false;
+
+  function checkIfDone() {
+    if (has_attribute_unset_loaded &&
+        has_attribute_invalid_loaded &&
+        has_attribute_auto_loaded &&
+        has_attribute_on_loaded) {
+      t.done();
+    }
+  }
+
+  document.getElementById("attribute_unset").addEventListener("load", t.step_func(function() {
+    assert_false(has_attribute_unset_loaded);
+    has_attribute_unset_loaded = true;
+    checkIfDone();
+  }));
+  document.getElementById("attribute_invalid").addEventListener("load", t.step_func(function() {
+    assert_false(has_attribute_invalid_loaded);
+    has_attribute_invalid_loaded = true;
+    checkIfDone();
+  }));
+  document.getElementById("attribute_auto").addEventListener("load", t.step_func(function() {
+    assert_false(has_attribute_auto_loaded);
+    has_attribute_auto_loaded = true;
+    checkIfDone();
+  }));
+  document.getElementById("attribute_on").addEventListener("load", t.step_func(function() {
+    assert_false(has_attribute_on_loaded);
+    has_attribute_on_loaded = true;
+    checkIfDone();
+  }));
+
+  window.addEventListener("load", t.step_func_done(function() {
+    document.getElementById("attribute_unset").setAttribute("lazyload", "off");
+    document.getElementById("attribute_invalid").setAttribute("lazyload", "off");
+    document.getElementById("attribute_auto").setAttribute("lazyload", "off");
+    document.getElementById("attribute_on").setAttribute("lazyload", "off");
+  }));
+</script>
diff --git a/loading/lazyload/resources/image_1.png b/loading/lazyload/resources/image_1.png
diff --git a/loading/lazyload/resources/image_2.png b/loading/lazyload/resources/image_2.png
diff --git a/loading/lazyload/resources/image_3.png b/loading/lazyload/resources/image_3.png
diff --git a/loading/lazyload/resources/image_4.png b/loading/lazyload/resources/image_4.png
diff --git a/loading/lazyload/resources/subframe_1.html b/loading/lazyload/resources/subframe_1.html
@@ -0,0 +1,5 @@
+<html>
+  <body>
+    <p>Subframe 1.</p>
+  </body>
+</html>
diff --git a/loading/lazyload/resources/subframe_2.html b/loading/lazyload/resources/subframe_2.html
@@ -0,0 +1,5 @@
+<html>
+  <body>
+    <p>Subframe 2.</p>
+  </body>
+</html>
diff --git a/loading/lazyload/resources/subframe_3.html b/loading/lazyload/resources/subframe_3.html
@@ -0,0 +1,5 @@
+<html>
+  <body>
+    <p>Subframe 3.</p>
+  </body>
+</html>
diff --git a/loading/lazyload/resources/subframe_4.html b/loading/lazyload/resources/subframe_4.html
@@ -0,0 +1,5 @@
+<html>
+  <body>
+    <p>Subframe 4.</p>
+  </body>
+</html>
diff --git a/loading/lazyload/scroll_to_attribute_auto_iframe.tentative.sub.html b/loading/lazyload/scroll_to_attribute_auto_iframe.tentative.sub.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<head>
+  <title>Iframes with lazyload="auto" load when in the viewport</title>
+  <link rel="author" title="Scott Little" href="mailto:[email protected]">
+  <link rel="help" href="https://github.com/whatwg/html/pull/3752">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<!--
+Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
+-->
+
+<body>
+  <iframe id="in_viewport" src="https://{{hosts[][www]}}:{{ports[https][0]}}/loading/lazyload/resources/subframe_1.html" width="200px" height="100px" lazyload="auto"></iframe>
+  <div style="height:10000px;"></div>
+  <iframe id="below_viewport" src="https://{{hosts[][www]}}:{{ports[https][0]}}/loading/lazyload/resources/subframe_2.html" width="200px" height="100px" lazyload="auto"></iframe>
+</body>
+
+<script>
+  var t = async_test("Test that iframes with lazyload='auto' that enter the viewport get loaded.");
+
+  var has_in_viewport_loaded = false;
+  var has_below_viewport_loaded = false;
+
+  document.getElementById("in_viewport").addEventListener("load", t.step_func(function() {
+    assert_false(has_in_viewport_loaded);
+    has_in_viewport_loaded = true;
+    if (has_below_viewport_loaded) {
+      // Note that the below_viewport element's load event could happen before
+      // the window.load event occurs, if the browser decides to load it
+      // immediately instead of lazily loading. This is valid behavior, so the
+      // test has passed if the below_viewport element has loaded.
+      t.done();
+    } else {
+      document.getElementById("below_viewport").scrollIntoView();
+    }
+  }));
+
+  document.getElementById("below_viewport").addEventListener("load", t.step_func(function() {
+    assert_false(has_below_viewport_loaded);
+    has_below_viewport_loaded = true;
+    if (has_in_viewport_loaded) {
+      t.done();
+    }
+  }));
+</script>
diff --git a/loading/lazyload/scroll_to_attribute_auto_image.tentative.html b/loading/lazyload/scroll_to_attribute_auto_image.tentative.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<head>
+  <title>Images with lazyload="auto" load when in the viewport</title>
+  <link rel="author" title="Scott Little" href="mailto:[email protected]">
+  <link rel="help" href="https://github.com/whatwg/html/pull/3752">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<!--
+Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
+-->
+
+<body>
+  <img id="in_viewport" src="resources/image_1.png" lazyload="auto">
+  <div style="height:10000px;"></div>
+  <img id="below_viewport" src="resources/image_2.png" lazyload="auto">
+</body>
+
+<script>
+  var t = async_test("Test that images with lazyload='auto' that enter the viewport get loaded.");
+
+  var has_in_viewport_loaded = false;
+  var has_below_viewport_loaded = false;
+
+  document.getElementById("in_viewport").addEventListener("load", t.step_func(function() {
+    assert_false(has_in_viewport_loaded);
+    has_in_viewport_loaded = true;
+    if (has_below_viewport_loaded) {
+      // Note that the below_viewport element's load event could happen before
+      // the window.load event occurs, if the browser decides to load it
+      // immediately instead of lazily loading. This is valid behavior, so the
+      // test has passed if the below_viewport element has loaded.
+      t.done();
+    } else {
+      document.getElementById("below_viewport").scrollIntoView();
+    }
+  }));
+
+  document.getElementById("below_viewport").addEventListener("load", t.step_func(function() {
+    assert_false(has_below_viewport_loaded);
+    has_below_viewport_loaded = true;
+    if (has_in_viewport_loaded) {
+      t.done();
+    }
+  }));
+</script>
diff --git a/loading/lazyload/scroll_to_attribute_invalid_iframe.tentative.sub.html b/loading/lazyload/scroll_to_attribute_invalid_iframe.tentative.sub.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<head>
+  <title>Iframes with invalid values for lazyload attributes load when in the viewport</title>
+  <link rel="author" title="Scott Little" href="mailto:[email protected]">
+  <link rel="help" href="https://github.com/whatwg/html/pull/3752">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<!--
+Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
+-->
+
+<body>
+  <iframe id="in_viewport" src="https://{{hosts[][www]}}:{{ports[https][0]}}/loading/lazyload/resources/subframe_1.html" width="200px" height="100px" lazyload="invalid_value"></iframe>
+  <div style="height:10000px;"></div>
+  <iframe id="below_viewport" src="https://{{hosts[][www]}}:{{ports[https][0]}}/loading/lazyload/resources/subframe_2.html" width="200px" height="100px" lazyload="invalid_value"></iframe>
+</body>
+
+<script>
+  var t = async_test("Test that iframes with invalid values for lazyload attributes that enter the viewport get loaded.");
+
+  var has_in_viewport_loaded = false;
+  var has_below_viewport_loaded = false;
+
+  document.getElementById("in_viewport").addEventListener("load", t.step_func(function() {
+    assert_false(has_in_viewport_loaded);
+    has_in_viewport_loaded = true;
+    if (has_below_viewport_loaded) {
+      // Note that the below_viewport element's load event could happen before
+      // the window.load event occurs, if the browser decides to load it
+      // immediately instead of lazily loading. This is valid behavior, so the
+      // test has passed if the below_viewport element has loaded.
+      t.done();
+    } else {
+      document.getElementById("below_viewport").scrollIntoView();
+    }
+  }));
+
+  document.getElementById("below_viewport").addEventListener("load", t.step_func(function() {
+    assert_false(has_below_viewport_loaded);
+    has_below_viewport_loaded = true;
+    if (has_in_viewport_loaded) {
+      t.done();
+    }
+  }));
+</script>