Terence Eden

I think I've found a font rendering bug in #Firefox (and possibly Safari).

On the National Theatre website, Ronkẹ Adékọluẹ́jọ́'s name doesn't embolden characters with diacritical marks.

As far as I can see, the included Web Font contains é (U+00E9) and both ́ (U+0301) & ̣ (U+0323).
But doesn't include ẹ (U+1EB9) or ọ (U+1ECD).

Any thoughts on what's causing this and whether it is worth reporting?

URl: https://www.nationaltheatre.org.uk/artists/ronke-adekoluejo/
Font: https://www.nationaltheatre.org.uk/themes/childtheme/assets/fonts/5760911/470ca328-5bc8-43ae-b713-6fb2efeea277.woff2

Mar 13 at 10:30amWeb
Show threadTerence EdenMar 13

If you have Safari on a Mac or iOS, could you please send me a screenshot of the output of this page?

https://codepen.io/edent/pen/qEaRyrz

Thanks!

FF Font Rendering Issue?

...

Show threadTerence EdenMar 13

Thanks all.

Raised as a bug with both #Firefox and #Safari.

https://bugzilla.mozilla.org/show_bug.cgi?id=2023126
https://bugs.webkit.org/show_bug.cgi?id=309889

2023126 - Broken rendering of a font with combining diacritics

UNCONFIRMED (nobody) in Firefox - Untriaged. Last updated 2026-03-13.

Show threadLaura KalbagMar 13
@Edent Safari on macOS
Show threadTerence EdenMar 13
@laura
Ooooooh! So broken there as well?
Ta mate!
Show threadLaura KalbagMar 13
@Edent looks like it!
Show threadEric GoodwinMar 13
@laura @Edent and iOS. Current os.
Show threadMike Coats 🏴󠁧󠁢󠁳󠁣󠁴󠁿🇪🇺🌍♻️Mar 13
@Edent Safari on iOS.
Show threadEliza MBMar 13

@Edent

I barely use Safari, but AIUI all iOS browsers use the same underlying tech. My default on this iPad is either brave or Vivaldi, I’ll check which if you want a screenshot anyway.

Show thread@PrivacyMattersMar 13
@Edent safari iOS
Show threadThomas RigbyMar 13
@Edent
Show threadErik AblesonMar 13
@Edent coming from Safari on an iPad running 26.3.1
Show threadCat WestMar 13
@Edent
Show threadCat WestMar 13
@Edent Same as @erik
Show threadSimon Cox Mar 13
@Edent
Oh good catch - I removed the font-weight:normal; in Inspector and it rendered all in bold so something is definitely up.
Show threadEric GoodwinMar 13
@Edent it’s likely that the bold font they’re using doesn’t have those characters. I’ve run into this with fancy, paid, fonts before.
Show threadStuart LangridgeMar 13
@Edent that's not a bug, is it? If your font doesn't have the characters it's meant to display, then the characters display in some fallback font that _does_ have them. It's not ideal but it's hard to see what ought to happen in that situation. But you know that, so I feel like I've misunderstood the issue?
Show threadTerence EdenMar 13
@sil
It doesn't have the character "ẹ́"
But it does have the character "é" and the low dot combinator.
So it should successfully combine the two.
At least, it does in Chrome.
Show threadStuart LangridgeMar 13
@Edent ah, understood! then yeah, no idea, sounds like you're right and they ought to be doing better!