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102 lines
2.0 KiB
HTML
102 lines
2.0 KiB
HTML
<!DOCTYPE html>
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<html lang="en" class="reftest-wait">
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<meta charset="utf-8">
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<title>Scrollboxes with non-uniform backgrounds should prevent their contents from pulling background colors, even if those contents start out above uniform backgrounds</title>
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<style>
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div {
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min-height: 50px;
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box-model: border-box;
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}
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.first, .second {
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border: 1px solid blue;
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margin: 50px 0;
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}
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.border {
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border: 1px solid black;
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}
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.underlap {
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border: 1px solid #088;
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margin-left: 120px;
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width: 80px;
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margin-bottom: -30px;
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}
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.scrollable {
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height: auto;
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overflow: auto;
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}
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.scrollarea {
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width: 5000px;
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border: none;
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padding: 10px 0 20px;
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height: auto;
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}
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.scrolled {
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margin-left: 220px;
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width: 100px;
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height: 100px;
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border-color: red;
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}
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body {
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margin: 0;
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padding: 0 100px;
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height: 3000px;
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}
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</style>
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<div class="first" reftest-assigned-layer="page-background">
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<!--
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This is just a regular box, it should end up in the page background layer.
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-->
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</div>
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<div class="underlap">
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<!--
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This item intersects with the scrollable box and is positioned below
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.scrollable, in z-order.
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-->
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</div>
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<div class="scrollable border">
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<div class="scrollarea">
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<div class="scrolled border reftest-no-paint">
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<!--
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This box starts out above solid white background, but it will move so
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that it intersects .underlap, so it shouldn't pull up a background
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color to begin with so that it doesn't need to invalidate.
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-->
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</div>
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</div>
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</div>
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<div class="second" reftest-assigned-layer="page-background">
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<!--
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This should share a layer with .first and the page background.
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-->
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</div>
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<script>
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var scrollable = document.querySelector(".scrollable");
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function doTest() {
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scrollable.scrollLeft = 100;
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document.documentElement.removeAttribute("class");
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}
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// Make .scrollable start out with active scrolling.
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scrollable.scrollLeft = 0;
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scrollable.scrollLeft = 10;
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document.addEventListener("MozReftestInvalidate", doTest, false);
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</script>
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