109 lines
3.5 KiB
HTML
109 lines
3.5 KiB
HTML
<!DOCTYPE html>
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<title>CSSOM View - scrollIntoView considers sideways-rl writing mode</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link rel="author" title="Cathie Chen" href="mailto:cathiechen@igalia.com">
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<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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.box {
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float: left;
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width: 200px;
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height: 200px;
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}
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#scroller {
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writing-mode: sideways-rl;
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overflow: scroll;
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width: 300px;
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height: 300px;
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}
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#container{
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width: 600px;
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height: 600px;
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}
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#target {
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background-color: #ff0;
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}
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</style>
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<body>
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<div id="scroller">
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<div id="container">
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<!-- ROW-1 -->
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<div class="row">
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<div class="box"></div>
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<div class="box"></div>
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<div class="box"></div>
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</div>
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<!-- ROW-2 -->
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<div class="row">
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<div class="box"></div>
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<div class="box" id="target"></div>
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<div class="box"></div>
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</div>
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<!-- ROW-3 -->
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<div class="row">
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<div class="box"></div>
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<div class="box"></div>
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<div class="box"></div>
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</div>
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</div>
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</div>
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<script>
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// In sideways-rl mode, X corresponds to the block axis and is oriented leftward.
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// Y corresponds to the inline axis and is oriented downward.
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// So the beginning edges are the top and right edges and the ending edges are the bottom and left edges.
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// According to the spec, x be min(0, max(x, element padding edge width - element scrolling area width)).
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// So x is nonpositive and decreases leftward.
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// This assumes that the horizontal scrollbar is on the bottom side and the vertical scrollbar is on the left side.
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var target = document.getElementById("target");
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var scroller = document.getElementById("scroller");
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var scrollbar_width = scroller.offsetWidth - scroller.clientWidth;
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var scroller_width = scroller.offsetWidth;
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var scroller_height = scroller.offsetHeight;
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var box_width = target.offsetWidth;
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var box_height = target.offsetHeight;
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var expectedX = {
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blockStart: -box_width,
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blockCenter: -((3*box_width - scroller_width)/2) - scrollbar_width/2,
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blockEnd: -(2*box_width - scroller_width) - scrollbar_width,
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};
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var expectedY = {
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inlineStart: box_height,
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inlineCenter: ((3*box_height - scroller_height)/2) + (scrollbar_width/2),
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inlineEnd: ((2*box_height) - scroller_height) + scrollbar_width,
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};
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[
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[{block: "start", inline: "start"}, expectedX.blockStart, expectedY.inlineStart],
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[{block: "start", inline: "center"}, expectedX.blockStart, expectedY.inlineCenter],
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[{block: "start", inline: "end"}, expectedX.blockStart, expectedY.inlineEnd],
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[{block: "center", inline: "start"}, expectedX.blockCenter, expectedY.inlineStart],
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[{block: "center", inline: "center"}, expectedX.blockCenter, expectedY.inlineCenter],
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[{block: "center", inline: "end"}, expectedX.blockCenter, expectedY.inlineEnd],
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[{block: "end", inline: "start"}, expectedX.blockEnd, expectedY.inlineStart],
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[{block: "end", inline: "center"}, expectedX.blockEnd, expectedY.inlineCenter],
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[{block: "end", inline: "end"}, expectedX.blockEnd, expectedY.inlineEnd],
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].forEach(([input, expectedX, expectedY]) => {
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test(() => {
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scroller.scrollTo(0, 0);
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target.scrollIntoView(input);
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assert_approx_equals(scroller.scrollLeft, expectedX, 0.5, "scrollX");
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assert_approx_equals(scroller.scrollTop, expectedY, 0.5, "scrollY");
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}, `scrollIntoView(${JSON.stringify(input)})`);
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})
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</script>
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</body>
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</html>
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