src/css/support.js

   1 import { document } from "../var/document.js";
   2 import { documentElement } from "../var/documentElement.js";
   3 import { support } from "../var/support.js";
   4
   5 ( function() {
   6
   7 var reliableTrDimensionsVal,
   8         div = document.createElement( "div" );
   9
  10 // Finish early in limited (non-browser) environments
  11 if ( !div.style ) {
  12         return;
  13 }
  14
  15 // Support: IE 10 - 11+
  16 // IE misreports `getComputedStyle` of table rows with width/height
  17 // set in CSS while `offset*` properties report correct values.
  18 // Support: Firefox 70+
  19 // Only Firefox includes border widths
  20 // in computed dimensions. (gh-4529)
  21 support.reliableTrDimensions = function() {
  22         var table, tr, trStyle;
  23         if ( reliableTrDimensionsVal == null ) {
  24                 table = document.createElement( "table" );
  25                 tr = document.createElement( "tr" );
  26
  27                 table.style.cssText = "position:absolute;left:-11111px;border-collapse:separate";
  28                 tr.style.cssText = "box-sizing:content-box;border:1px solid";
  29
  30                 // Support: Chrome 86+
  31                 // Height set through cssText does not get applied.
  32                 // Computed height then comes back as 0.
  33                 tr.style.height = "1px";
  34                 div.style.height = "9px";
  35
  36                 // Support: Android Chrome 86+
  37                 // In our bodyBackground.html iframe,
  38                 // display for all div elements is set to "inline",
  39                 // which causes a problem only in Android Chrome, but
  40                 // not consistently across all devices.
  41                 // Ensuring the div is `display: block`
  42                 // gets around this issue.
  43                 div.style.display = "block";
  44
  45                 documentElement
  46                         .appendChild( table )
  47                         .appendChild( tr )
  48                         .appendChild( div );
  49
  50                 // Don't run until window is visible
  51                 if ( table.offsetWidth === 0 ) {
  52                         documentElement.removeChild( table );
  53                         return;
  54                 }
  55
  56                 trStyle = window.getComputedStyle( tr );
  57                 reliableTrDimensionsVal = ( Math.round( parseFloat( trStyle.height ) ) +
  58                         Math.round( parseFloat( trStyle.borderTopWidth ) ) +
  59                         Math.round( parseFloat( trStyle.borderBottomWidth ) ) ) === tr.offsetHeight;
  60
  61                 documentElement.removeChild( table );
  62         }
  63         return reliableTrDimensionsVal;
  64 };
  65 } )();
  66
  67 export { support };