<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>219735</bug_id>
          
          <creation_ts>2020-12-10 02:39:31 -0800</creation_ts>
          <short_desc>Implement ascent-override, descent-override, and line-gap-override</short_desc>
          <delta_ts>2026-07-01 18:10:28 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Text</component>
          <version>Other</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>NEW</bug_status>
          <resolution></resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>BrowserCompat, InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Enhancement</bug_severity>
          <target_milestone>---</target_milestone>
          
          <blocked>246579</blocked>
          <everconfirmed>1</everconfirmed>
          <reporter name="Tobi Reif">tobi</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>agafvv</cc>
    
    <cc>benoit.rouleau</cc>
    
    <cc>chen.jingan</cc>
    
    <cc>chrisjshull</cc>
    
    <cc>chriskirknielsen+wkbugs</cc>
    
    <cc>fuliang8</cc>
    
    <cc>gabrien.symons</cc>
    
    <cc>jesse.bc</cc>
    
    <cc>karlcow</cc>
    
    <cc>kizmarh</cc>
    
    <cc>m.hohengarten</cc>
    
    <cc>mmaxfield</cc>
    
    <cc>paul.c.pederson</cc>
    
    <cc>peter</cc>
    
    <cc>rasec_1113</cc>
    
    <cc>rik</cc>
    
    <cc>taishi.eguchi</cc>
    
    <cc>tyler</cc>
    
    <cc>webkit-bug-importer</cc>
    
    <cc>webkitbugzilla</cc>
    
    <cc>webkitbugzilla</cc>
    
    <cc>webkit</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1713476</commentid>
    <comment_count>0</comment_count>
    <who name="Tobi Reif">tobi</who>
    <bug_when>2020-12-10 02:39:31 -0800</bug_when>
    <thetext>It would be very useful if you could implement ascent-override, descent-override, and line-gap-override.

More info:

https://bugs.chromium.org/p/chromium/issues/detail?id=800693
(especially comments #20, #30 and #31)

https://tobireif.com/non_site_stuff/test_case_for_font_position_report_yet_another_font/

https://www.w3.org/TR/css-fonts-4/#font-metrics-override-desc</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1713864</commentid>
    <comment_count>1</comment_count>
    <who name="Tobi Reif">tobi</who>
    <bug_when>2020-12-11 02:31:31 -0800</bug_when>
    <thetext>Chrome supports it (tested on MacOS vs Windows).</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1715350</commentid>
    <comment_count>2</comment_count>
    <who name="Radar WebKit Bug Importer">webkit-bug-importer</who>
    <bug_when>2020-12-17 02:40:18 -0800</bug_when>
    <thetext>&lt;rdar://problem/72419793&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1718256</commentid>
    <comment_count>3</comment_count>
    <who name="Tobi Reif">tobi</who>
    <bug_when>2021-01-08 03:33:03 -0800</bug_when>
    <thetext>Here&apos;s one reason why it&apos;s important to implement this feature:

https://tobireif.com/posts/ensuring_the_correct_vertical_position_of_large_text/

(And there&apos;s another reason listed in the post below &quot;Another use case&quot;.)</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1729079</commentid>
    <comment_count>4</comment_count>
      <attachid>420285</attachid>
    <who name="Tobi Reif">tobi</who>
    <bug_when>2021-02-15 01:52:30 -0800</bug_when>
    <thetext>Created attachment 420285
the general issue

Given that the issue can be as severe as in the attached screenshot, please consider assigning a high priority to implementing this feature.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1742744</commentid>
    <comment_count>5</comment_count>
    <who name="Tobi Reif">tobi</who>
    <bug_when>2021-03-23 03:43:55 -0700</bug_when>
    <thetext>Chrome and Edge support the properties, and they are currently getting implemented in Firefox:
https://bugzilla.mozilla.org/show_bug.cgi?id=1681691

I hope that they will get implemented in Safari soon.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1772610</commentid>
    <comment_count>6</comment_count>
    <who name="Tobi Reif">tobi</who>
    <bug_when>2021-06-25 03:15:28 -0700</bug_when>
    <thetext>Chrome, Edge, and Firefox support it.

Safari now is the only major browser which doesn&apos;t support this feature.

Please implement it soon.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1877267</commentid>
    <comment_count>7</comment_count>
    <who name="Rick">webkitbugzilla</who>
    <bug_when>2022-06-22 04:03:10 -0700</bug_when>
    <thetext>+1 for Safari implementation!</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1884657</commentid>
    <comment_count>8</comment_count>
    <who name="Fu liang">fuliang8</who>
    <bug_when>2022-07-17 18:24:28 -0700</bug_when>
    <thetext>+1 for Safari implementation!</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1896332</commentid>
    <comment_count>9</comment_count>
    <who name="Roel Nieskens">webkitbugzilla</who>
    <bug_when>2022-09-05 06:43:43 -0700</bug_when>
    <thetext>+1! Any news on when/if this will land?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1896346</commentid>
    <comment_count>10</comment_count>
    <who name="Jesse Bennett-Chamberlain">jesse.bc</who>
    <bug_when>2022-09-05 07:59:23 -0700</bug_when>
    <thetext>+1 these properties (along with size-adjust) would be useful for any application that allows users to change their preferred typeface.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1905860</commentid>
    <comment_count>11</comment_count>
    <who name="Tim Nguyen (:ntim)">ntim</who>
    <bug_when>2022-10-15 08:41:57 -0700</bug_when>
    <thetext>*** Bug 229726 has been marked as a duplicate of this bug. ***</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1915624</commentid>
    <comment_count>12</comment_count>
    <who name="Cesar">rasec_1113</who>
    <bug_when>2022-11-30 09:18:29 -0800</bug_when>
    <thetext>+1 - Would like to see updates on this</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2035600</commentid>
    <comment_count>13</comment_count>
    <who name="Tyler Sticka">tyler</who>
    <bug_when>2024-05-15 12:54:34 -0700</bug_when>
    <thetext>+1 Would love to see this happen!</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2054055</commentid>
    <comment_count>14</comment_count>
    <who name="Gabrien Symons">gabrien.symons</who>
    <bug_when>2024-08-20 07:26:33 -0700</bug_when>
    <thetext>+1 to have in Safari!</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2078753</commentid>
    <comment_count>15</comment_count>
    <who name="">m.hohengarten</who>
    <bug_when>2024-12-03 01:49:15 -0800</bug_when>
    <thetext>+1 I&apos;d love to see this 3 years old standard feature on every other browser engine (Blink/Geko supports it since 2021) becoming a standard in all browser engines.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2112214</commentid>
    <comment_count>16</comment_count>
    <who name="">paul.c.pederson</who>
    <bug_when>2025-04-21 10:33:39 -0700</bug_when>
    <thetext>Believe it or not the lack of support for this feature in safari is costing us thousands of dollars. @Tim Nguyen (:ntim) is there any way we could get this moved up in the team&apos;s queue?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2225594</commentid>
    <comment_count>17</comment_count>
    <who name="shierote">taishi.eguchi</who>
    <bug_when>2026-06-30 23:53:09 -0700</bug_when>
    <thetext>This has been open five years now, with steady interest but no status update. Every other major engine shipped these descriptors in 2021, the spec is stable, and the scope looks modest — so it&apos;d help the community to understand where this stands.

@Tim Nguyen (:ntim) Is there a blocker or design concern holding it back, or is it just unstaffed? If it&apos;s the latter, is this something an outside contributor could reasonably pick up with some guidance? Happy to help however is useful.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2225978</commentid>
    <comment_count>18</comment_count>
    <who name="shierote">taishi.eguchi</who>
    <bug_when>2026-07-01 18:10:28 -0700</bug_when>
    <thetext>I&apos;ve implemented all three descriptors (ascent-override, descent-override, line-gap-override) in PR #68431: https://github.com/WebKit/WebKit/pull/68431
Feedback from the Text component owners would be very welcome.</thetext>
  </long_desc>
      
          <attachment
              isobsolete="0"
              ispatch="0"
              isprivate="0"
          >
            <attachid>420285</attachid>
            <date>2021-02-15 01:52:30 -0800</date>
            <delta_ts>2021-02-15 01:52:30 -0800</delta_ts>
            <desc>the general issue</desc>
            <filename>02_windows_chrome_no_overrides.png</filename>
            <type>image/png</type>
            <size>12462</size>
            <attacher name="Tobi Reif">tobi</attacher>
            
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</data>

          </attachment>
      

    </bug>

</bugzilla>