Bug 267358 – Emphasized text does not render on MDN, does on Chrome and Firefox

• Component: Text
• Status: NEW

[Jon Lee]

Look for "I love carrots" here:

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/strong

and compare to Chrome and Firefox.

On Safari, the "love" or "carrots" are not italicized.

May be a similar issue to 215605, but the font-face rules do not include font-variation-settings in this case.

[Radar WebKit Bug Importer]

<rdar://problem/120802106>

[Karl Dubost]

Very interesting.

```
:root {
    --font-fallback: BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    --font-body: Inter, var(--font-fallback);
    --font-heading: Inter, var(--font-fallback);
…
```


Removing 
    --font-body: Inter, var(--font-fallback);
makes it work. 

or replacing by 
    --font-body: var(--font-fallback);
makes it work too.

[Jon Lee]

Inter is a variable font with a slant axis.

[Karl Dubost]

Related Bug 200369 ?

[Ahmad Saleem]

*** Bug 281164 has been marked as a duplicate of this bug. ***

[Karl Dubost]

I have done a full diagnosis on Bug 281164. See there.

[Karl Dubost]

https://searchfox.org/wubkat/rev/d46c14cf9008c4385cf0ac7919561b278d047e85/Source/WebCore/platform/graphics/coretext/FontCustomPlatformDataCoreText.cpp#147-158
```cpp
bool FontCustomPlatformData::supportsFormat(const String& format)
{
    return equalLettersIgnoringASCIICase(format, "truetype"_s)
        || equalLettersIgnoringASCIICase(format, "opentype"_s)
        || equalLettersIgnoringASCIICase(format, "woff2"_s)
        || equalLettersIgnoringASCIICase(format, "woff2-variations"_s)
        || equalLettersIgnoringASCIICase(format, "woff-variations"_s)
        || equalLettersIgnoringASCIICase(format, "truetype-variations"_s)
        || equalLettersIgnoringASCIICase(format, "opentype-variations"_s)
        || equalLettersIgnoringASCIICase(format, "woff"_s)
        || equalLettersIgnoringASCIICase(format, "svg"_s);
}
```

[Karl Dubost]

it works with 
"woff2 supports variations"
but it doesn't work with 
"woff2-variations"

or the combination of both.