scrollIntoView-sideways-rl-writing-mode.html

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This test has a WPT meta file that expects 8 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/cssom-view/scrollIntoView-sideways-rl-writing-mode.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>CSSOM View - scrollIntoView considers sideways-rl writing mode</title>

<meta charset="utf-8">

<meta name="viewport" content="width=device-width,initial-scale=1">

<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>