subsup-1.html (6581B)
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="utf-8"> 5 <title>Subscripts and Superscripts metrics</title> 6 <link rel="help" href="https://w3c.github.io/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup"> 7 <meta name="assert" content="Basic metrics for elements msub, msup and msubsup."> 8 <script src="/resources/testharness.js"></script> 9 <script src="/resources/testharnessreport.js"></script> 10 <script src="/mathml/support/feature-detection.js"></script> 11 <script src="/mathml/support/fonts.js"></script> 12 <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" /> 13 <style> 14 math, mspace { 15 font: 25px/1 Ahem; 16 } 17 </style> 18 <script> 19 /* This test does not use a font with a MATH table and does not verify layout 20 rules in a very strict way. */ 21 22 function getBox(aId) { 23 var box = document.getElementById(aId).getBoundingClientRect(); 24 box.middle = (box.bottom + box.top) / 2; 25 return box; 26 } 27 28 setup({ explicit_done: true }); 29 window.addEventListener("load", () => { loadAllFonts().then(runTests); }); 30 31 function runTests() { 32 test(function() { 33 assert_true(MathMLFeatureDetection.has_mspace()); 34 35 var e = 1; 36 assert_less_than_equal(getBox("msubBase").right, getBox("msubSub").left, e, "msub: subscript is after base"); 37 assert_less_than_equal(getBox("msupBase").right, getBox("msupSup").left, e, "msup: superscript is after base"); 38 assert_less_than_equal(getBox("msubsupBase").right, getBox("msubsupSub").left, e, "msubsup: subscript is after base"); 39 assert_less_than_equal(getBox("msubsupBase").right, getBox("msubsupSup").left, e, "msubsup: superscript is after base"); 40 41 e = 3; 42 assert_approx_equals(getBox("msubBase").right, getBox("msubSub").left, e, "msub: space between base and subscript is small"); 43 assert_approx_equals(getBox("msubBase").right, getBox("msubSub").left, e, "msub: subscript is after base"); 44 assert_approx_equals(getBox("msupBase").right, getBox("msupSup").left, e, "msup: superscript is after base"); 45 assert_approx_equals(getBox("msubsupBase").right, getBox("msubsupSub").left, e, "msubsup: subscript is after base"); 46 assert_approx_equals(getBox("msubsupBase").right, getBox("msubsupSup").left, e, "msubsup: superscript is after base"); 47 }, "Respective horizontal positions"); 48 49 test(function() { 50 assert_true(MathMLFeatureDetection.has_mspace()); 51 52 var e = 1; 53 assert_approx_equals(getBox("msubBase").middle, getBox("baseline").bottom, e, "msub: base is placed on the baseline"); 54 assert_approx_equals(getBox("msupBase").middle, getBox("baseline").bottom, e, "msup: base is placed on the baseline"); 55 assert_approx_equals(getBox("msubsupBase").middle, getBox("baseline").bottom, e, "msubsup: base is placed on the baseline"); 56 }, "Alignment of the base on the baseline"); 57 58 test(function() { 59 assert_true(MathMLFeatureDetection.has_mspace()); 60 61 assert_greater_than(getBox("msubSub").middle, getBox("msubBase").middle, "msub: script is placed at the bottom of the base"); 62 assert_less_than(getBox("msupSup").middle, getBox("msupBase").middle, "msup: script is placed at the top of the base"); 63 assert_greater_than(getBox("msubsupSub").middle, getBox("msubsupBase").middle, "msubsup: script is placed at the bottom of the base"); 64 assert_less_than(getBox("msubsupSup").middle, getBox("msubsupBase").middle, "msubsup: script is placed at the top of the base"); 65 }, "Vertical position of scripts"); 66 67 test(function() { 68 assert_true(MathMLFeatureDetection.has_mspace()); 69 70 var e = 5; 71 assert_approx_equals(getBox("msub").width, getBox("msubSub").right - getBox("msubBase").left, e, "msub: width is determined by the left/right sides of base/script (+ some space after script)"); 72 assert_approx_equals(getBox("msup").width, getBox("msupSup").right - getBox("msupBase").left, e, "msup: width is determined by the left/right sides of base/script (+ some space after script)"); 73 assert_approx_equals(getBox("msubsup").width, Math.max(getBox("msubsupSub").right, getBox("msubsupSup").right) - getBox("msubsupBase").left, e, "msubsup: width is determined by the left/right sides of base/scripts (+ some space after script)"); 74 }, "Width of scripted elements"); 75 76 test(function() { 77 assert_true(MathMLFeatureDetection.has_mspace()); 78 79 var e = 1; 80 assert_greater_than_equal(getBox("msub").height, getBox("msubBase").height, e, "msub: height is at least the one of the base"); 81 assert_greater_than_equal(getBox("msup").height, getBox("msupBase").height, e, "msup: height is at least the one of the base"); 82 assert_greater_than_equal(getBox("msubsup").height, getBox("msubsupBase").height, e, "msubsup: height is at least the one of the base"); 83 84 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"); 85 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"); 86 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"); 87 }, "Height of scripted elements"); 88 89 done(); 90 } 91 </script> 92 </head> 93 <body> 94 <div id="log"></div> 95 <p> 96 <math> 97 <mspace id="baseline" width="30px" height="2px" depth="0px" style="background: blue"/> 98 <msub id="msub" style="background: green"> 99 <mspace id="msubBase" width="30px" height="15px" depth="15px" style="background: black"/> 100 <mspace id="msubSub" width="10px" height="5px" depth="5px" style="background: black"/> 101 </msub> 102 <msup id="msup" style="background: blue"> 103 <mspace id="msupBase" width="30px" height="15px" depth="15px" style="background: black"/> 104 <mspace id="msupSup" width="10px" height="5px" depth="5px" style="background: black"/> 105 </msup> 106 <msubsup id="msubsup" style="background: green"> 107 <mspace id="msubsupBase" width="30px" height="15px" depth="15px" style="background: black"/> 108 <mspace id="msubsupSub" width="10px" height="5px" depth="5px" style="background: black"/> 109 <mspace id="msubsupSup" width="10px" height="5px" depth="5px" style="background: black"/> 110 </msubsup> 111 </math> 112 </p> 113 </body> 114 </html>