subsup-2.html - mozsearch

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>Subscripts and Superscripts metrics</title>

<link rel="help" href="https://w3c.github.io/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup">

<meta name="assert" content="Basic metrics for the mmultiscript element.">

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

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

<script src="/mathml/support/feature-detection.js"></script>

<script src="/mathml/support/fonts.js"></script>

<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />

<style>

  math, mspace {

    font: 25px/1 Ahem;

</style>

<script>

  /* This test does not use a font with a MATH table and does not verify layout

     rules in a very strict way. */

  function getBox(aId) {

    var box = document.getElementById(aId).getBoundingClientRect();

    box.middle = (box.bottom + box.top) / 2;

    return box;

  setup({ explicit_done: true });

  window.addEventListener("load", () => { loadAllFonts().then(runTests); });

  function runTests() {

    test(function() {

      assert_true(MathMLFeatureDetection.has_mspace());

      var e = 1;

      assert_less_than_equal(getBox("msubBase").right, getBox("msubSub").left, e, "subscript is after base");

      assert_less_than_equal(getBox("msupBase").right, getBox("msupSup").left, e, "superscript is after base");

      assert_less_than_equal(getBox("msubsupBase").right, getBox("msubsupSub").left, e, "subscript is after base");

      assert_less_than_equal(getBox("msubsupBase").right, getBox("msubsupSup").left, e, "superscript is after base");

     assert_greater_than_equal(getBox("premsubBase").right, getBox("premsubSub").left, e, "subscript is before base");

      assert_greater_than_equal(getBox("premsupBase").right, getBox("premsupSup").left, e, "superscript is before base");

      assert_greater_than_equal(getBox("premsubsupBase").right, getBox("premsubsupSub").left, e, "subscript is before base");

      assert_greater_than_equal(getBox("premsubsupBase").right, getBox("premsubsupSup").left, e, "superscript is before base");

      e = 3;

      assert_approx_equals(getBox("msubBase").right, getBox("msubSub").left, e, "msub: space between base and subscript is small");

      assert_approx_equals(getBox("msubBase").right, getBox("msubSub").left, e, "msub: subscript is after base");

      assert_approx_equals(getBox("msupBase").right, getBox("msupSup").left, e, "msup: superscript is after base");

      assert_approx_equals(getBox("msubsupBase").right, getBox("msubsupSub").left, e, "msubsup: subscript is after base");

      assert_approx_equals(getBox("msubsupBase").right, getBox("msubsupSup").left, e, "msubsup: superscript is after base");

      assert_approx_equals(getBox("premsubBase").left, getBox("premsubSub").right, e, "msub: space between base and subscript is small");

      assert_approx_equals(getBox("premsubBase").left, getBox("premsubSub").right, e, "msub: subscript is after base");

      assert_approx_equals(getBox("premsupBase").left, getBox("premsupSup").right, e, "msup: superscript is after base");

      assert_approx_equals(getBox("premsubsupBase").left, getBox("premsubsupSub").right, e, "msubsup: subscript is after base");

      assert_approx_equals(getBox("premsubsupBase").left, getBox("premsubsupSup").right, e, "msubsup: superscript is after base");

    }, "Respective horizontal positions");

    test(function() {

      assert_true(MathMLFeatureDetection.has_mspace());

      var e = 1;

      assert_approx_equals(getBox("msubBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");

      assert_approx_equals(getBox("msupBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");

      assert_approx_equals(getBox("msubsupBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");

      assert_approx_equals(getBox("premsubBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");

      assert_approx_equals(getBox("premsupBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");

      assert_approx_equals(getBox("premsubsupBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");

    }, "Alignment of the base on the baseline");

    test(function() {

      assert_true(MathMLFeatureDetection.has_mspace());

      assert_greater_than(getBox("msubSub").middle, getBox("msubBase").middle, "script is placed at the bottom of the base");

      assert_less_than(getBox("msupSup").middle, getBox("msupBase").middle, "script is placed at the top of the base");

      assert_greater_than(getBox("msubsupSub").middle, getBox("msubsupBase").middle, "script is placed at the bottom of the base");

      assert_less_than(getBox("msubsupSup").middle, getBox("msubsupBase").middle, "script is placed at the top of the base");

      assert_greater_than(getBox("premsubSub").middle, getBox("premsubBase").middle, "script is placed at the bottom of the base");

      assert_less_than(getBox("premsupSup").middle, getBox("premsupBase").middle, "script is placed at the top of the base");

      assert_greater_than(getBox("premsubsupSub").middle, getBox("premsubsupBase").middle, "script is placed at the bottom of the base");

      assert_less_than(getBox("premsubsupSup").middle, getBox("premsubsupBase").middle, "script is placed at the top of the base");

    }, "Vertical position of scripts");

    test(function() {

      assert_true(MathMLFeatureDetection.has_mspace());

      var e = 3;

      assert_approx_equals(getBox("msub").width, getBox("msubSub").right - getBox("msubBase").left, e, "width is determined by the left/right sides of base/script (+ some space after script)");

      assert_approx_equals(getBox("msup").width, getBox("msupSup").right - getBox("msupBase").left, e, "width is determined by the left/right sides of base/script (+ some space after script)");

      assert_approx_equals(getBox("msubsup").width, Math.max(getBox("msubsupSub").right, getBox("msubsupSup").right) - getBox("msubsupBase").left, e, "width is determined by the left/right sides of base/scripts (+ some space after script)");

      assert_approx_equals(getBox("premsub").width, getBox("premsubBase").right - getBox("premsubSub").left, e, "width is determined by the right/left sides of base/script (+ some space after script)");

      assert_approx_equals(getBox("premsup").width, getBox("premsupBase").right - getBox("premsupSup").left, e, "width is determined by the right/left sides of base/script (+ some space after script)");

      assert_approx_equals(getBox("premsubsup").width, getBox("premsubsupBase").right - Math.min(getBox("premsubsupSub").left, getBox("premsubsupSup").left), e, "width is determined by the right/left sides of base/scripts (+ some space after script)");

    }, "Width of scripted elements");

    test(function() {

      assert_true(MathMLFeatureDetection.has_mspace());

      var e = 5;

      assert_greater_than_equal(getBox("msub").height, getBox("msubBase").height, e, "height is at least the one of the base");

      assert_greater_than_equal(getBox("msup").height, getBox("msupBase").height, e, "height is at least the one of the base");

      assert_greater_than_equal(getBox("msubsup").height, getBox("msubsupBase").height, e, "height is at least the one of the base");

      assert_greater_than_equal(getBox("premsub").height, getBox("premsubBase").height, e, "height is at least the one of the base");

      assert_greater_than_equal(getBox("premsup").height, getBox("premsupBase").height, e, "height is at least the one of the base");

  assert_greater_than_equal(getBox("premsubsup").height, getBox("premsubsupBase").height, e, "height is at least the one of the base");

      assert_approx_equals(getBox("msub").height, Math.max(getBox("msubSub").bottom, getBox("msubBase").bottom) - getBox("msubBase").top, e, "msub height is determined by the top/bottom sides of base/scripts");

      assert_approx_equals(getBox("msup").height, getBox("msupBase").bottom - Math.min(getBox("msupSup").top, getBox("msupBase").top), e, "msup height is determined by the top/bottom sides of base/scripts");

      assert_approx_equals(getBox("msubsup").height, Math.max(getBox("msubSub").bottom, getBox("msubBase").bottom) - Math.min(getBox("msupSup").top, getBox("msupBase").top), e, "msubsup height is determined by the top/bottom sides of base/scripts");

      assert_approx_equals(getBox("premsub").height, Math.max(getBox("premsubSub").bottom, getBox("premsubBase").bottom) - getBox("premsubBase").top, e, "msub height is determined by the top/bottom sides of base/scripts");

      assert_approx_equals(getBox("premsup").height, getBox("premsupBase").bottom - Math.min(getBox("premsupSup").top, getBox("premsupBase").top), e, "msup height is determined by the top/bottom sides of base/scripts");

      assert_approx_equals(getBox("premsubsup").height, Math.max(getBox("premsubSub").bottom, getBox("premsubBase").bottom) - Math.min(getBox("premsupSup").top, getBox("premsupBase").top), e, "msubsup height is determined by the top/bottom sides of base/scripts");

    }, "Height of scripted elements");

    test(function() {

      ["none", "mprescripts"].forEach(function(name) {

        var elements = document.getElementsByTagName(name);

        for (var i = 0; i < elements.length; i++) {

          var box = elements[i].getBoundingClientRect();

          assert_equals(box.height * box.width, 0, "<" + name + "> " + i + " has zero is empty");

});

    }, "Size of empty elements");

    done();

</script>

</head>

<body>

  <div id="log"></div>

<p>

    <math>

      <mspace id="baseline" width="30px" height="2px" depth="0px" style="background: blue"/>

      <mmultiscripts id="msub" style="background: green">

        <mspace id="msubBase" width="30px" height="15px" depth="15px" style="background: black"/>

        <mspace id="msubSub" width="10px" height="5px" depth="5px" style="background: black"/>

        <none/>

      </mmultiscripts>

      <mmultiscripts id="msup" style="background: green">

        <mspace id="msupBase" width="30px" height="15px" depth="15px" style="background: black"/>

        <none/>

        <mspace id="msupSup" width="10px" height="5px" depth="5px" style="background: black"/>

      </mmultiscripts>

      <mmultiscripts id="msubsup" style="background: green">

        <mspace id="msubsupBase" width="30px" height="15px" depth="15px" style="background: black"/>

        <mspace id="msubsupSub" width="10px" height="5px" depth="5px" style="background: black"/>

        <mspace id="msubsupSup" width="10px" height="5px" depth="5px" style="background: black"/>

      </mmultiscripts>

      <mmultiscripts id="premsub" style="background: green">

        <mspace id="premsubBase" width="30px" height="15px" depth="15px" style="background: black"/>

        <mprescripts/>

        <mspace id="premsubSub" width="10px" height="5px" depth="5px" style="background: black"/>

        <none/>

      </mmultiscripts>

      <mmultiscripts id="premsup" style="background: green">

        <mspace id="premsupBase" width="30px" height="15px" depth="15px" style="background: black"/>

        <mprescripts/>

        <none/>

        <mspace id="premsupSup" width="10px" height="5px" depth="5px" style="background: black"/>

      </mmultiscripts>

      <mmultiscripts id="premsubsup" style="background: green">

        <mspace id="premsubsupBase" width="30px" height="15px" depth="15px" style="background: black"/>

        <mprescripts/>

        <mspace id="premsubsupSub" width="10px" height="5px" depth="5px" style="background: black"/>

        <mspace id="premsubsupSup" width="10px" height="5px" depth="5px" style="background: black"/>

      </mmultiscripts>

    </math>

  </p>

</body>

</html>

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