Bug 168533 – Font Loading API specifies font is loaded but sizing of font after load reports inconsistent values

• Status: RESOLVED
• Resolution: FIXED
• Component: Text

[Steven Saviano]

jsfiddle: https://jsfiddle.net/0ko9fLwo/1/

Refresh that page and look at the JS console. It repros via refresh/cmd-R.

Steps:
1) Create a new FontFace object with fallbacks in the source string on page load
2) Load the FontFace
3) Add to documents.fonts
4) Monitor sizing of text with the font

Expected: Element size stays consistent post FontFace load

Actual: Element size has one value and then another post FontFace load. 

Occurs on:
a) Version 10.0.2 (12602.3.12.0.1)
b) Release 23 (Safari 10.2, WebKit 12604.1.5)


It appears this has to do with fallbacks in the font source strings (and potentially that this is done in the initial page load). If the font source string is only the remote url, then the sizing inconsistency does not occur.
https://jsfiddle.net/6eshwbuc/1/

[Radar WebKit Bug Importer]

<rdar://problem/30585192>

[Myles C. Maxfield]

Created attachment 305054 [details]
WIP

[Myles C. Maxfield]

Created attachment 305056 [details]
WIP

[Myles C. Maxfield]

Created attachment 305058 [details]
WIP

[Build Bot]

Comment on attachment 305058 [details]
WIP

Attachment 305058 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/3378966

New failing tests:
fast/text/web-font-load-fallback-during-loading.html

[Build Bot]

Created attachment 305065 [details]
Archive of layout-test-results from ews104 for mac-elcapitan-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews104  Port: mac-elcapitan-wk2  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 305058 [details]
WIP

Attachment 305058 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.webkit.org/results/3379005

New failing tests:
fast/text/web-font-load-fallback-during-loading.html

[Build Bot]

Created attachment 305066 [details]
Archive of layout-test-results from ews100 for mac-elcapitan

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews100  Port: mac-elcapitan  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 305058 [details]
WIP

Attachment 305058 [details] did not pass mac-debug-ews (mac):
Output: http://webkit-queues.webkit.org/results/3378988

New failing tests:
fast/text/web-font-load-fallback-during-loading.html

[Build Bot]

Created attachment 305067 [details]
Archive of layout-test-results from ews113 for mac-elcapitan

The attached test failures were seen while running run-webkit-tests on the mac-debug-ews.
Bot: ews113  Port: mac-elcapitan  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 305058 [details]
WIP

Attachment 305058 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: http://webkit-queues.webkit.org/results/3379028

New failing tests:
fast/text/web-font-load-fallback-during-loading.html

[Build Bot]

Created attachment 305068 [details]
Archive of layout-test-results from ews125 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews125  Port: ios-simulator-wk2  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 305058 [details]
WIP

Attachment 305058 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: http://webkit-queues.webkit.org/results/3379446

New failing tests:
fast/text/web-font-load-fallback-during-loading.html

[Build Bot]

Created attachment 305072 [details]
Archive of layout-test-results from ews126 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews126  Port: ios-simulator-wk2  Platform: Mac OS X 10.11.6

[Myles C. Maxfield]

Created attachment 305111 [details]
Patch

[Myles C. Maxfield]

Created attachment 308764 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 308764 [details]
Patch

Clearing flags on attachment: 308764

Committed r216079: <http://trac.webkit.org/changeset/216079>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.