159617 2016-07-11 02:17:41 -0700 font-size measured in ex or ch scales quadratically with page zoom 2022-08-29 14:24:50 -0700 1 1 1 Unclassified WebKit Layout and Rendering Safari 9 Unspecified Unspecified NEW BrowserCompat, InRadar P2 Normal --- 1 peter webkit-unassigned ahmad.saleem792 ap bfulgham mmaxfield rniwa simon.fraser webkit-bug-importer wenson_hsieh zalan oldest_to_newest 1209611 0 peter 2016-07-11 02:17:41 -0700 WebKit's behavior seems identical to https://bugs.chromium.org/p/chromium/issues/detail?id=408777. Copied from there: > Example URL: > http://web.mit.edu/andersk/Public/font-size-css-units.html > > Steps to reproduce the problem: > 1. Visit http://web.mit.edu/andersk/Public/font-size-css-units.html > 2. At 100% page zoom, observe that all the lines are roughly the same size. > 3. Zoom in. > > What is the expected behavior? > All lines should get bigger by the same ratio. > > What went wrong? > The lines where font-size is measured in ex or ch get bigger much faster than the other lines. At 500% page zoom, they are shown at 25 times their original size. > > Does it occur on multiple sites: Yes > > Does this work in other browsers? Yes While Blink is also affected, Firefox and IE/Edge are not. Thanks in advance for looking into it! 1564888 1 peter 2019-08-26 00:43:02 -0700 The Blink bug has been fixed now, cf. https://bugs.chromium.org/p/chromium/issues/detail?id=408777. Using WebKitGTK+ 2.24.2, it appears the problem has been partially fixed in WebKit as well, i.e., it seems ex units are ok but ch units are still scaling up too much. 1894468 2 ahmad.saleem792 2022-08-29 03:38:40 -0700 I am able to reproduce this bug in Safari Technology Preview 152 on macOS 12.5.1 and while zooming into test case from Comment 0, both "ch" and "ex" font-size grow faster than others while in all other browsers (Chrome Canary 107 and Firefox Nightly 106), it is not the case. Just wanted to share updated testing results. Thanks! 1894638 3 webkit-bug-importer 2022-08-29 14:24:50 -0700 <rdar://problem/99295934>