<!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="Verify metrics of scripted elements for bases of different heights."> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/mathml/support/feature-detection.js"></script> <style> math, mspace { font-size: 10px; } </style> <script> /* This test does not use any specific fonts and so the exact rules are not specified precisely. We assume reasonable values for script shifts and spacing. */ 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", runTests); var sizeArray = [50, 75, 100]; function runTests() { test(function() { assert_true(MathMLFeatureDetection.has_mspace()); var e = 1; sizeArray.forEach(function(size) { assert_approx_equals(getBox("msub" + size + "base").middle, getBox("baseline").bottom, e, "msub base " + size + "is placed on the baseline"); assert_approx_equals(getBox("msup" + size + "base").middle, getBox("baseline").bottom, e, "msup base " + size + "is placed on the baseline"); assert_approx_equals(getBox("msubsup" + size + "base").middle, getBox("baseline").bottom, e, "msubsup base " + size + "is placed on the baseline"); assert_approx_equals(getBox("multi" + size + "base").middle, getBox("baseline").bottom, e, "mmultiscripts base " + size + "is placed on the baseline"); }); }, "Alignment on the baseline for bases of different heights"); test(function() { assert_true(MathMLFeatureDetection.has_mspace()); var e = 5; sizeArray.forEach(function(size) { assert_approx_equals(getBox("msub" + size + "sub").middle, getBox("msub" + size + "base").bottom, e, "msub script " + size + "is placed at the top of of the base"); }); }, "Vertical position of the scripts for bases of different heights"); done(); } </script> </head> <body> <div id="log"></div> <p> <math> <mspace id="baseline" width="30px" height="2px" depth="0px" style="background: blue"/> <msub id="msub50"> <mspace id="msub50base" width="30px" height="50px" depth="50px" style="background: black"/> <mspace id="msub50sub" width="10px" height="5px" depth="5px" style="background: black"/> </msub> <msup id="msup50"> <mspace id="msup50base" width="30px" height="50px" depth="50px" style="background: black"/> <mspace id="msup50sup" width="10px" height="5px" depth="5px" style="background: black"/> </msup> <msubsup id="msubsup50"> <mspace id="msubsup50base" width="30px" height="50px" depth="50px" style="background: black"/> <mspace id="msubsup50sub" width="10px" height="5px" depth="5px" style="background: black"/> <mspace id="msubsup50sup" width="10px" height="5px" depth="5px" style="background: black"/> </msubsup> <mmultiscripts id="multi50"> <mspace id="multi50base" width="30px" height="50px" depth="50px" style="background: black"/> <mspace id="multi50postsub" width="10px" height="5px" depth="5px" style="background: black"/> <mspace id="multi50postsup" width="10px" height="5px" depth="5px" style="background: black"/> <mprescripts/> <mspace id="multi50presub" width="10px" height="5px" depth="5px" style="background: black"/> <mspace id="multi50presup" width="10px" height="5px" depth="5px" style="background: black"/> </mmultiscripts> <msub id="msub75"> <mspace id="msub75base" width="30px" height="75px" depth="75px" style="background: black"/> <mspace id="msub75sub" width="10px" height="5px" depth="5px" style="background: black"/> </msub> <msup id="msup75"> <mspace id="msup75base" width="30px" height="75px" depth="75px" style="background: black"/> <mspace id="msup75sup" width="10px" height="5px" depth="5px" style="background: black"/> </msup> <msubsup id="msubsup75"> <mspace id="msubsup75base" width="30px" height="75px" depth="75px" style="background: black"/> <mspace id="msubsup75sub" width="10px" height="5px" depth="5px" style="background: black"/> <mspace id="msubsup75sup" width="10px" height="5px" depth="5px" style="background: black"/> </msubsup> <mmultiscripts id="multi75"> <mspace id="multi75base" width="30px" height="75px" depth="75px" style="background: black"/> <mspace id="multi75postsub" width="10px" height="5px" depth="5px" style="background: black"/> <mspace id="multi75postsup" width="10px" height="5px" depth="5px" style="background: black"/> <mprescripts/> <mspace id="multi75presub" width="10px" height="5px" depth="5px" style="background: black"/> <mspace id="multi75presub" width="10px" height="5px" depth="5px" style="background: black"/> </mmultiscripts> <msub id="msub100"> <mspace id="msub100base" width="30px" height="100px" depth="100px" style="background: black"/> <mspace id="msub100sub" width="10px" height="5px" depth="5px" style="background: black"/> </msub> <msup id="msup100"> <mspace id="msup100base" width="30px" height="100px" depth="100px" style="background: black"/> <mspace id="msup100sup" width="10px" height="5px" depth="5px" style="background: black"/> </msup> <msubsup id="msubsup100"> <mspace id="msubsup100base" width="30px" height="100px" depth="100px" style="background: black"/> <mspace id="msubsup100sub" width="10px" height="5px" depth="5px" style="background: black"/> <mspace id="msubsup100sup" width="10px" height="5px" depth="5px" style="background: black"/> </msubsup> <mmultiscripts id="multi100"> <mspace id="multi100base" width="30px" height="100px" depth="100px" style="background: black"/> <mspace id="multi100postsub" width="10px" height="5px" depth="5px" style="background: black"/> <mspace id="multi100postsup" width="10px" height="5px" depth="5px" style="background: black"/> <mprescripts/> <mspace id="multi100presub" width="10px" height="5px" depth="5px" style="background: black"/> <mspace id="multi100presup" width="10px" height="5px" depth="5px" style="background: black"/> </mmultiscripts> </math> </p> </body> </html>