Fix css/css-typed-om/the-stylepropertymap/properties/letter-spacing.html WPT test so that it expects "normal" as computed value when the input is a length that is zero, as per:
For legacy reasons, a computed letter-spacing of zero yields a resolved value (getComputedStyle() return value) of normal.
Pull request: https://github.com/WebKit/WebKit/pull/8167
Committed 258447@main (54dd46449a73): <https://commits.webkit.org/258447@main>
Reviewed commits have been landed. Closing PR #8167 and removing active labels.