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<!DOCTYPE html>
<title>CSSOM View - scrollIntoView considers vertical-rl writing mode</title>
<meta charset="utf-8">
<link rel="author" title="Suneel Kota" href="mailto:suneel.kota@samsung.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: vertical-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>
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 = [ ((2*box_width)-scroller_width)+scrollbar_width, ((3*box_width - scroller_width)/2)+ (scrollbar_width/2), box_width ];
var expectedY = [ box_height, ((3*box_height - scroller_height)/2) + (scrollbar_width/2), ((2*box_height)-scroller_height) + scrollbar_width ];
// As browsers differ in the meaning of scrollLeft when
// in a right-to-left mode, we adjust the expectation
// to match the semantics of scrollLeft.
if(scroller.scrollLeft === 0)
expectedX = [ -box_width, -(((3*box_width - scroller_width)/2)+ (scrollbar_width/2)), -(((2*box_width)-scroller_width)+scrollbar_width)];
// This formats dict as a string suitable as test name.
// format_value() is provided by testharness.js,
// which also preserves sign for -0.
function format_dict(dict) {
const props = [];
for (let prop in dict) {
props.push(`${prop}: ${format_value(dict[prop])}`);
}
return `{${props.join(", ")}}`;
}
[
[{block: "start", inline: "start"}, expectedX[0], expectedY[0]],
[{block: "start", inline: "center"}, expectedX[0], expectedY[1]],
[{block: "start", inline: "end"}, expectedX[0], expectedY[2]],
[{block: "center", inline: "start"}, expectedX[1], expectedY[0]],
[{block: "center", inline: "center"}, expectedX[1], expectedY[1]],
[{block: "center", inline: "end"}, expectedX[1], expectedY[2]],
[{block: "end", inline: "start"}, expectedX[2], expectedY[0]],
[{block: "end", inline: "center"}, expectedX[2], expectedY[1]],
[{block: "end", inline: "end"}, expectedX[2], expectedY[2]],
].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(${format_dict(input)})`);
})
</script>
</body>
</html>
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