Safari Technology Preview Release 230 is now available for download for macOS Tahoe and macOS Sequoia. If you already have Safari Technology Preview installed, you can update it in System Settings under General → Software Update.

This release includes WebKit changes between: 300291@main…300986@main.

Animations

Resolved Issues

• Fixed animation-name resolution to correctly find matching @keyframes within tree-scoped and shadow DOM contexts. (300706@main) (156484228)

CSS

Resolved Issues

• Fixed incorrect handling of auto inline margins on grid items during track sizing that caused excessive vertical spacing in subgrids. (300422@main) (157638931)
• Fixed CSS anchor positioning to remember the last successful position option at ResizeObserver delivery time, aligning with the spec. (300890@main) (159225250)
• Fixed an issue where transitioning an element to display: none with transition-behavior: allow-discrete and CSS Anchor Positioning would repeatedly restart the transition. (300519@main) (160421419)
• Fixed the acceptable anchor algorithm in CSS Anchor Positioning to correctly consider inline elements as containing blocks. (300614@main) (160917762)
• Fixed CSS nesting to inline parent selectors when possible instead of always wrapping them in :is() to improve selector performance. (300297@main) (160927950)
• Fixed position-try-fallback resolution by treating names as tree-scoped references to properly search shadow DOM host scopes. (300333@main) (161081231)
• Fixed an issue where a <select> element with long <option> text caused horizontal scrolling when nested inside a flex item. (300684@main) (161563289)
• Fixed getComputedStyle to return numeric values (2) for orphans and widows instead of the internal auto value, ensuring the computed values correctly reflect the CSS specification. (300690@main) (161566631)
• Fixed column-count: 1 so that it now correctly creates a multi-column container per the CSS Multi-column Layout specification. (300787@main) (161611444)
• Fixed the calculation of anchor positions in vertical-rl multi-column layouts by correctly flipping coordinates in fragmented flows. (300807@main) (161616545)
• Fixed the order to try anchor position fallback options, such that the last successful position option is tried first, followed by the original style, and then the remaining options. (300909@main) (161714637)
• Fixed position-area handling to include the in-flow scrollable area of the initial containing block. (300921@main) (161741583)
• Fixed position-visibility: no-overflow to respond correctly to scrolling. (301211@main) (162173481)
• Fixed: Renamed position-area keywords from x-self-start, x-self-end, y-self-start, and y-self-end to self-x-start, self-x-end, self-y-start, and self-y-end respectively to align with updated CSSWG specifications.(301226@main) (162214793)

HTML

Resolved Issues

• Fixed an issue where navigating to :~:text fragments on dynamically generated pages did not highlight or scroll to the fragment. (300918@main) (150880542)

MathML

Resolved Issues

• Fixed rendering of unknown MathML elements so they now behave like mrow as required by the MathML Core specification. (300580@main) (148593275)

Media

Resolved Issues

• Fixed MediaRecorder to no longer fire erroneous error events when stopped immediately after track changes, aligning behavior with Chrome and closer to Firefox. (300682@main) (161124260)

Rendering

Resolved Issues

• Fixed incorrect clipping of position:fixed/sticky content during view transitions. (300561@main) (154886047)
• Fixed an issue that caused cropped flexbox elements to render incorrectly. (300433@main) (159638640)
• Fixed an issue where sticky elements at the edge of the viewport could disappear during rubber band scrolling. (300544@main) (160385933)
• Fixed flickering of elements with slow-painting content during view transitions. (300902@main) (160886647)
• Fixed an issue where elements with both opacity and CSS filter effects could render incorrectly. (300549@main) (161130683)
• Fixed an issue where elements with background images were not counted as contentful for Paint Timing. (300667@main) (161456094)

SVG

Resolved Issues

• Fixed an issue where stop-color incorrectly accepted hashless hex color values like 1234 by treating them as invalid to follow the spec. (300296@main) (119166640)
• Fixed an issue where SVG pattern tileImage could appear blurred or pixelated when zooming or printing. (300357@main) (159202567)
• Fixed SVGAElement so that its rel and relList attributes now affect navigation behavior, including proper handling of noopener, noreferrer, and the new opener value, aligning SVG links with HTMLAnchorElement behavior. (300462@main) (160724516)

Security

Resolved Issues

• Fixed parsing of require-trusted-types-for in CSP to ensure 'script' is only valid when followed by whitespace or end of buffer. (300770@main) (147760089)

Web API

New Features

• Added support for Largest Contentful Paint. (300834@main) (161705604)

Resolved Issues

• Fixed an issue where the first pointerdown event was lost after triggering a context menu by right-clicking. (300696@main) (84787733)
• Fixed Trusted Types to only verify event handler attributes for elements in the XHTML, SVG, and MathML namespaces, preventing incorrect checks on other namespaces. (300783@main) (147763139)
• Fixed an issue where navigate.back in the main frame would fail after a navigate.back in a child frame by properly clearing the provisional history item to allow correct back navigation. (301092@main) (158259024)
• Fixed NavigateEvent.sourceElement to correctly reference the submitting HTMLFormElement instead of null when a form is submitted. (301252@main) (160391355)
• Fixed EventCounts interface was not maplike. Enables use of methods such as .forEach(), keys(), and entries(). (300830@main) (160968888)
• Fixed an issue where mousemove events were still dispatched to removed mouseover targets instead of their parent element when the target was deleted. (300522@main) (161203639)
• Fixed missing pointerenter and mouseenter events when a child element moved under the mouse. (300564@main) (161362257)
• Fixed an issue where only one CSP violation report was sent for multiple enforced require-trusted-types-for directives. (300832@main) (161740298)
• Fixed Trusted Types incorrectly treating null or undefined policy return values as null instead of empty strings during createHTML, createScript, and createScriptURL operations. (300892@main) (161837641)

Web Extension

New Features

• Added support for browser.runtime.getVersion() to retrieve the extension version from its manifest. (300972@main) (161742137)

Web Inspector

Resolved Issues

• Fixed syntax highlighting for JavaScript features like template literals, private class elements, optional chaining, and others. (300332@main) (107619553)
• Fixed an issue where navigating the DOM tree using the keyboard would get stuck in a loop within certain subtrees. (300471@main) (159841729)
• Fixed an issue where adding DOM attributes or node siblings did not work correctly when using the actions from the context menu. (300752@main) (161577627)