Created attachment 431860 [details] Video of bug Steps to reproduce - Add a CSS property with a shorthand notation that includes a keyword: `text-decoration: 1px 2px black` - Move the typing cursor over the second value (2px) - Hold the Arrow Up key to increment the value Result: The first value increments. The issue doesn't occur when the entire shorthand value is made up of pairs of numbers and units. For example: `margin: 1px 1px 1px 1px` forks fine, incrementing/decrementing the correct value at the cursor position.
<rdar://problem/79561858>
Bug no longer reproduces.