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