See https://drafts.csswg.org/css-text-decor-4/#text-decoration-skip-inset-property This is important for Japanese & Chinese to maintain a separation between decoration lines appearing on adjacent elements with no space in between.
Bug 1977845 Comment 0 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
See https://drafts.csswg.org/css-text-decor-4/#text-decoration-skip-inset-property (and https://github.com/w3c/clreq/issues/599). This is important for Japanese & Chinese to maintain a separation between decoration lines appearing on adjacent elements with no space in between.