Created attachment 422219 [details]
Kerning issue is visible in Safari 14.0.3 (dev tools open to show source)
WebKit does not apply kerning between inline elements. To reproduce the issue, add two inline elements (e.g. span) inside a block (p, h1, h2, ...) that contain a continuous text and the kerning issue is clearly visible when the text is rendered on screen.
This is an example (with no CSS, no JS, everything is default in the document):
This is a slightly different example with only one inline element, but the issue is the same:
The second p element with the same text is for reference. Blink seems to be unaffected (Chrome 88.0.4324.192).
*** This bug has been marked as a duplicate of bug 6148 ***