[wp-trac] [WordPress Trac] #48062: "NonBreakingSpaceOverride" of Twenty Nineteen theme breaks "ch" CSS unit

Tue Sep 17 22:46:06 UTC 2019

#48062: "NonBreakingSpaceOverride" of Twenty Nineteen theme breaks "ch" CSS unit
--------------------------+-----------------------------
 Reporter:  Andy Schmidt  |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Themes        |    Version:  5.2.3
 Severity:  major         |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 Took me a while to figure out why some of our columnar layouts were all
 broken and wrapping in odd places with the new theme. Turns out, the
 Twenty Nineteen theme prevents usage of the "ch" CSS unit, because it
 replies on your "NonBreakSpaceOverride" font.

 In Chrome, Mobile Safari (and Edge/IE11), the ch width is calculated as
 TWICE the correct width vs. the native Hoefler font. In Firefox it renders
 identical.

 On the other hand, the ex width is calculated slightly smaller (incl.
 Firefox, but NOT Mobile Safari), but that would be tolerable.

 This sample page will render the FIRST set of DIVs precisely - the SECOND
 set of DIVs demonstrates the problem:

 {{{
 <html>
         <head>
                 <style>
                         @font-face {
                           font-family: 'NonBreakingSpaceOverride';
                           src: url(data:application/font-
 woff2;charset=utf-8;base64,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
 2MJfSD10dPGA5PIJJQMkah0ugMJiv6x4Dm7LEa8xnrRGGGLAg4sAlbsA07sAt76DOsXKO3hIjtIlpnnFrt1qW4kh6NhS83P/6HB/fl1SMAAA==)
 format("woff2"), url(data:application/font-
 woff;charset=utf-8;base64,d09GRgABAAAAAAUQAA0AAAAACDQAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAABGRlRNAAAE9AAAABwAAAAchf5yU0dERUYAAATYAAAAHAAAAB4AJwAbT1MvMgAAAaAAAABJAAAAYJAcgU5jbWFwAAACIAAAAF4AAAFqUUxBZ2dhc3AAAATQAAAACAAAAAgAAAAQZ2x5ZgAAApAAAAAyAAAAPL0n8y9oZWFkAAABMAAAADAAAAA2Fi93Z2hoZWEAAAFgAAAAHQAAACQOSgWaaG10eAAAAewAAAAzAAAAVC7TAQBsb2NhAAACgAAAABAAAAAsAOQBAm1heHAAAAGAAAAAHQAAACAAWQALbmFtZQAAAsQAAAF6AAADIYvD/Adwb3N0AAAEQAAAAI4AAADsapk2o3jaY2BkYGAA4ov5mwzj+W2+MnCzXwCKMNzgCBSB0LfbQDQ7AxuI4mBgAlEAFKQIRHjaY2BkYGD3+NvCwMDBAALsDAyMDKhAFAA3+wH3AAAAeNpjYGRgYBBl4GBgYgABEMnIABJzAPMZAAVmAGUAAAB42mNgZlJhnMDAysDCKsKygYGBYRqEZtrDYMT4D8gHSmEHjgUFOQwODAqqf9g9/rYwMLB7MNUAhRlBcsxBrMlASoGBEQAj8QtyAAAAeNrjYGBkAAGmWQwMjO8gmBnIZ2NA0ExAzNjAAFYJVn0ASBsD6VAIDZb7AtELAgANIgb9AHjaY2BgYGaAYBkGRgYQSAHyGMF8FgYPIM3HwMHAxMDGoMCwQIFLQV8hXvXP//9AcRCfAcb///h/ygPW+w/vb7olBjUHCTCyMcAFGZmABBO6AogThgZgIUsXAEDcEzcAAHjaY2BgECMCyoEgACZaAed42mNgYmRgYGBnYGNgYAZSDJqMgorCgoqCjECRXwwNrCAKSP5mAAFGBiRgyAAAi/YFBQAAeNqtkc1OwkAUhU/5M25cEhcsZic
 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)
 format("woff");
                         }

                         .hoefler {
                                 font-family: "Hoefler Text";
                         }

                         .nbspover {
                                 font-family: "NonBreakingSpaceOverride",
 "Hoefler Text";
                         }

                         .w20ch {
                                 width: 20ch;
                                 height: 1em;
                                 border: 1px solid red;
                         }

                         .w20ex {
                                 width: 20ex;
                                 height: 1em;
                                 border: 1px solid green;
                         }
                 </style>
         </head>
         <body>
                 <div class="hoefler">
                         <p>00000000000000000000</p>
                         <p>xxxxxxxxxxxxxxxxxxxx</p>
                         <div class="w20ch"> </div>
                         <div class="w20ex"> </div>
                 </div>
                 <div class="nbspover">
                         <p>00000000000000000000</p>
                         <p>xxxxxxxxxxxxxxxxxxxx</p>
                         <div class="w20ch"> </div>
                         <div class="w20ex"> </div>
                 </div>
         </body>
 </html>
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/48062>
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