scrollIntoView-horizontal-tb-writing-mode-and-rtl-direction.html

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This test has a WPT meta file that expects 6 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/cssom-view/scrollIntoView-horizontal-tb-writing-mode-and-rtl-direction.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>CSSOM View - scrollIntoView considers horizontal-tb and rtl direction</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">

<link rel="help" href="https://drafts.csswg.org/cssom-view/#scroll-an-element">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<style>

.box {

  float: left;

  width: 200px;

  height: 200px;

#scroller {

  direction: rtl;

  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 horizontal-tb mode and rtl direction, X corresponds to the inline axis

// and is oriented leftward. Y corresponds to the block 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 is 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 = {

  inlineStart: -box_width,

  inlineCenter: -((3*box_width - scroller_width)/2) - scrollbar_width/2,

  inlineEnd: -(2*box_width - scroller_width) - scrollbar_width,

};

var expectedY = {

    blockStart: box_height,

    blockCenter: (3*box_height - scroller_height)/2 + scrollbar_width/2,

    blockEnd: 2*box_height - scroller_height + scrollbar_width,

};

  [{block: "start", inline: "start"}, expectedX.inlineStart, expectedY.blockStart],

  [{block: "start", inline: "center"}, expectedX.inlineCenter, expectedY.blockStart],

  [{block: "start", inline: "end"}, expectedX.inlineEnd, expectedY.blockStart],

  [{block: "center", inline: "start"}, expectedX.inlineStart, expectedY.blockCenter],

  [{block: "center", inline: "center"}, expectedX.inlineCenter, expectedY.blockCenter],

  [{block: "center", inline: "end"}, expectedX.inlineEnd, expectedY.blockCenter],

  [{block: "end", inline: "start"}, expectedX.inlineStart, expectedY.blockEnd],

  [{block: "end", inline: "center"}, expectedX.inlineCenter, expectedY.blockEnd],

  [{block: "end", inline: "end"}, expectedX.inlineEnd, expectedY.blockEnd],

].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>