• Improved performance of getComputedStyle() and computed CSS property reads, including with stylesheets containing attribute selectors. (@scttcper, @asamuzaK)
• Fixed slowdowns when focusing elements and running interaction tests, which regressed in v30.1.2. (@scttcper)
• Fixed XMLHttpRequest reusing credentials supplied to xhr.open() after cross-origin redirects, including in response to authentication challenges from the destination.
• Fixed XMLHttpRequest incorrectly sending and accepting cookies after cross-origin redirects back to the document's origin when xhr.withCredentials is false.
• Fixed exceptions from malformed CSS math functions, such as calc(0px - @submenu_space), while parsing documents, stylesheets, and style declarations. (@rnavarro)
• Fixed getComputedStyle() ignoring style rules nested inside multiple @media rules.
• Fixed CSS shorthands overwriting longhands with higher priority or specificity during style computation, including declarations containing CSS variables.
• Fixed getComputedStyle() returning unresolved or inconsistent shorthand values, including for 'background', 'border', 'flex', 'font', 'margin', and 'padding', and incorrect shorthand defaults and inheritance.
• Fixed computed background positions to resolve font-relative lengths using the final font size and handle multiple image layers correctly.
• Fixed computed 'color' values depending on property read order, including unresolved color-mix() results, which regressed in v29.0.2.
• Fixed currentcolor border colors incorrectly becoming transparent when 'color' uses light-dark() or relative color syntax.
• Fixed CSS calculations that reduce to a percentage incorrectly producing pixel values, which regressed in v30.0.0.
• Fixed numeric font weights in the 'font' shorthand incorrectly setting 'line-height'.
• Fixed selector matching involving XML namespaces, and selectors such as [data-a|=""] failing to match empty values and values beginning with -. (@asamuzaK)