test_hit-testing-and-viewbox.xhtml

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<html xmlns="http://www.w3.org/1999/xhtml">

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=1486952

-->

<head>

  <title>Test that hit-testing works after a viewBox update</title>

  <style>

    :hover { fill: lime; }

  </style>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

</head>

<body onload="run()">

<script class="testbody" type="text/javascript">

<![CDATA[

SimpleTest.waitForExplicitFinish();

function run() {

  const div = $("div");

  const offsetX = div.offsetLeft;

  const offsetY = div.offsetTop;

  const outerRect = $("outerRect");

  const innerRect = $("innerRect");

  const outerSVG = $("outerSVG");

  const innerSVG = $("innerSVG");

  let got;

  // Update the inner SVG viewBox to "move" the inner rectangle off its current

  // position on screen:

  innerSVG.setAttribute("viewBox", "-25 0 50 50");

  got = document.elementFromPoint(offsetX + 150, offsetY + 25);

  is(got, innerRect, "Should hit inner rectangle (1)");

  // Update the inner SVG viewBox again. (At the time of writing, a reflow is

  // triggered the first time you change viewBox on an inner svg, so the

  // previous test is expected to always pass. This next test will fail if we're

  // updating overflows on the inner svg frame instead of its children).

  innerSVG.setAttribute("viewBox", "0 -25 50 50");

  got = document.elementFromPoint(offsetX + 100, offsetY + 75);

  is(got, innerRect, "Should hit inner rectangle (2)");

  // Now update the outer SVG viewBox and confirm that both rectangles are

  // registered.  (Note that in this case the overflow rectangle of the inner

  // svg is the inner svg's viewport, so be sure to "move" the outer svg so that

  // the "new" outer rectangle and inner svg are off the current outerRect

  // union inner svg viewport - hit testing still works in that union.)

  outerSVG.setAttribute("viewBox", "-200 0 400 100");

  // Outer:

  got = document.elementFromPoint(offsetX + 250, offsetY + 50);

  is(got, outerRect, "Should hit outer rectangle");

  // Inner:

  got = document.elementFromPoint(offsetX + 300, offsetY + 75);

  is(got, innerRect, "Should hit inner rectangle (3)");

  SimpleTest.finish();

]]>

</script>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1486952">Mozilla Bug 1486952</a>

<p id="display"></p>

<div id="content">

  <div width="100%" height="1" id="div"></div>

  <svg xmlns="http://www.w3.org/2000/svg" id="outerSVG" width="400" height="100"

       viewBox="0 0 400 100">

    <rect x="25" y="25" width="50" height="50" fill="red" id="outerRect" />

    <svg x="75" width="100" height="100" viewBox="0 0 50 50" id="innerSVG">

      <rect width="25" height="25" fill="red" id="innerRect" />

    </svg>

  </svg>

</div>

<pre id="test">

</pre>

</body>

</html>