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v30.1.3

• 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)

v30.1.2

• Updated URLs to support Unicode v18.0.0 in internationalized domain names.
• Reduced package size and memory use for CSS property definitions. (@​scttcper)
• Fixed severe slowdowns when building large DOM trees, including SVG charts with D3, which regressed in v30.1.0. (@​cmdcolin)
• Fixed exponentially slow reads of empty inherited CSS custom properties in deeply nested documents, and custom properties incorrectly inheriting past an initial reset. (@​scttcper)
• Fixed getComputedStyle() returning stale results after editing stylesheet declarations, selectors, or media queries, including in imported stylesheets.
• Fixed selector matching and computed styles after changes to form control checkedness, indeterminacy, selection, values, and validity, including during form resets and canceled clicks.
• Fixed computed styles for :focus, :focus-visible, :focus-within, and selectors containing them after focus changes, including inside focus and blur listeners. (@​asamuzaK)
• Fixed element.focus() incorrectly focusing elements hidden by 'display', including through shadow hosts and slots, and elements excluded by shadow DOM slot assignment. (@​asamuzaK)
• Fixed getComputedStyle() throwing for elements without inline-style support, including XML and MathML elements.
• Fixed a memory leak where stylesheet parsing retained the last parsed stylesheet's window after window.close().
• Fixed memory growth from long-lived MutationObserver instances retaining bookkeeping for garbage-collected nodes. (@​scttcper)
• Fixed retained select.selectedOptions collections becoming stale after selection changes and form resets.
• Fixed rejection of negative CSS sizing values, including for 'min-width', 'min-height', 'max-width', and 'max-height', which regressed in v30.1.0.
• Fixed handling of deeply nested color-mix() expressions, including exceptions during color resolution. (@​asamuzaK)

• 058c0f5 30.1.3
• fcd1fd1 Cascade parsed longhands independently
• a3ee786 Cascade computed style properties on demand
• f42dc15 Resolve colors before caching or using currentcolor
• 074b1fb Compute background-position lengths against the final font size
• d19598c Apply style rules nested in multiple @​media rules
• 45d626c Rule out attribute selector subjects before matching
• 3ff0a5b Upgrade Undici and remove abort workarounds
• 8813bb1 Ignore CSS declarations with unparseable math functions
• 63712d8 Fix XHR credentials across redirects
• Additional commits viewable in compare view

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