• Added support for 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. (@trooney)
• Fixed selector matching and computed styles after changes to form control checkedness, indeterminacy, selection, values, and validity, including during form resets and canceled clicks. (@trooney)
• 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. (@asamuzaK)
• 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)
• Fixed element.matches() and element.closest() failing to match SVG elements such as <foreignObject> and <linearGradient>, which regressed in @asamuzakjp/dom-selector v9.0.3. (@asamuzaK)
• Fixed :nth-child(n+B) and :nth-last-child(n+B) matching in element.matches() and stylesheet rules. (@asamuzaK)
• Fixed stale selector results for sibling combinators after DOM changes. (@asamuzaK)