Contents

Safari Technology Preview 213 Release Notes

Learn about the latest web technology updates in Safari Technology Preview: CSS, Editing, Forms, HTML, JavaScript, Media, Networking, PDF, Rendering, Storage, SVG, Tables, Text, Web Animations, Web API, Web Extensions, Web Inspector, and WebRTC.

Overview

Safari Technology Preview Release 213 is now available for download for macOS Sequoia and macOS Sonoma. 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: 288458@main…289651@main.

CSS

New Features

  • Implemented unicode-bidi text rendering UA rules (except for ruby elements). (288511@main) (142191490)

  • Added support for gradients with only one stop. (289469@main) (142796999)

Resolved Issues

  • Fixed contain: size breaking object-fit. (289287@main) (131866042)

  • Fixed broken revert-layer when logical group CSS properties are explicitly inherited. (289183@main) (140819138)

  • Fixed subsequent nested styles getting ignored after an incorrect nested selector. (289429@main) (142187930)

  • Fixed font-variant-caps: all-small-caps causing incorrect box-sizing in flex inline context. (289486@main) (142212550)

  • Fixed ensuring the correct logic is run for over-constrained cases when the absolute positioned box is a writing-mode root. (288797@main) (142214631)

  • Fixed text-box-trim accumulation failing when updating the CSS dynamically. (288480@main) (142386761)

  • Fixed text-emphasis to not paint emphasis marks on punctuations. (288476@main) (142387538)

  • Fixed sizing and positioning issues when a popover changes CSS position upon opening. (288655@main) (142491219)

  • Fixed view transitions to stop running when the user navigates with a swipe. (288956@main) (142844150)

Editing

Resolved Issues

  • Fixed document.execCommand("copy") only triggering if there is a selection. (288559@main) (27792460)

  • Fixed Hebrew text pasted from Safari getting aligned left. (289323@main) (139029945)

  • Fixed setting selection to not set focus unless there is an existing selection. (288555@main) (139075809)

Forms

Resolved Issues

  • Fixed <datalist> dropdown keyboard interactions to align with platform conventions. (289067@main) (143012287)

  • Fixed: Disabled all Writing Tools app menu items, except “Compose”, for empty editable content. (289243@main) (143332082)

HTML

Deprecations

  • Removed the composite attribute on an <img> element. (289071@main) (143109250)

JavaScript

Resolved Issues

  • Fixed: Increased the matchLimit for regular expressions, allowing complex matches on longer strings. (289319@main) (143202375)

Media

New Features

  • Enabled MediaSource prefers DecompressionSession by default. (289924@main) (142761051)

  • Enabled WebCodec’s AudioEncoder and AudioDecoder by default. (288965@main) (142916087)

Resolved Issues

  • Fixed handling an empty srcAttr in Media Element. (289432@main) (132042925)

  • Fixed the space key not pausing a video in fullscreen by making the video mouse focusable. (289220@main) (138037616)

  • Fixed playing video generating non-monotonic ‘timeupdate’ events. (288722@main) (142275184) (FB16222910)

  • Fixed websites calling play() during a seek() is allowed by the specification so that the play event is fired even if the seek hasn’t completed. (288577@main) (142517488)

  • Fixed seek not completing for WebM under some circumstances. (143372794)

  • Fixed MediaRecorderPrivateEncoder writing frames out of order. (289643@main) (143956063)

Networking

Deprecations

  • Changed 3DES cipher to show a warning to users that it is a legacy TLS cipher. (288742@main) (138948491)

PDF

Resolved Issues

  • Fixed switching a PDF from continuous to discrete mode displaying the page(s) that are at the top of the window, even when barely visible. (289212@main) (137608841)

  • Fixed the “Previous Page” context menu option not navigating to previous page in 2-up continuous mode. (289337@main) (139817364)

Rendering

Resolved Issues

  • Fixed adding out-of-flow objects under the inline in a continuation chain, when possible. (289451@main) (102421379)

  • Fixed the missing table collapsed border for <thead>, <tbody>, and <tfoot> elements in the wrong order. (289434@main) (110430887)

  • Fixed <input type="range"> taking up space even with width: 0 applied. (289184@main) (113402515)

  • Fixed absolute positioned child with percent to include containing block padding. (288460@main) (142321535)

  • Fixed a border not showing when a linear gradient and a border radius are set. (289101@main) (142617573)

  • Fixed relative-positioned input elements in scroll areas not rendering outlines. (289154@main) (142995142)

  • Fixed tabbing out of a popover causing a hang in certain cases. (289277@main) (143145544)

Storage

Resolved Issues

  • Fixed the Storage Access API to consider AllExceptPartitioned as not currently having cookie access, ensuring sites can request access to first-party cookie. (289450@main) (143508260)

SVG

New Features

  • Added support for the ch length type for character width, but does not include support for upright vertical character width. (288558@main) (142463263)

Resolved Issues

  • Fixed not propagating bbox for empty text to ancestors. (289394@main) (115217040)

  • Fixed dynamically updating the transform attribute. (289022@main) (140761655)

  • Fixed SVGElement.prototype.ownerSVGElement on the outermost <svg> in foreignObject. (289388@main) (143625675)

Tables

Resolved Issues

  • Fixed missing behavior for rowspan="0" on HTML tables where 0 means span over all the remaining rows. (288746@main) (133910430)

  • Fixed table section and row background to not be treated as opaque. (289047@main) (142588505)

Text

Resolved Issues

  • Fixed displaying OpenType-SVG color fonts. (288980@main) (137496217) (FB15426148)

Web Animations

Resolved Issues

  • Fixed computing the time offset as needed when applying accelerated actions. (288652@main) (142604875)

Web API

New Features

  • Added support for the URLPattern API. (288942@main) (142967833)

Resolved Issues

  • Fixed: Aligned some MIME type handling in EME with the MIME Sniffing standard. (288916@main) (114311586)

  • Fixed: Updated selectorText handling to align with the specification for CSSPageRule. (289428@main) (125588212)

  • Fixed matching emoji in an element’s id attribute from a <link rel=expect> with an href that uses percent-encoded syntax. (289174@main) (134531921)

  • Fixed render blocking for <link> to not match elements that are on a ‘stack of open elements’ for the parser. (289020@main) (135846827)

  • Fixed Distraction Control unexpectedly hiding out-of-flow elements that overlap with a hidden element. (288593@main) (136358918)

  • Fixed the HTML parser phone number handling to better account for MathML. (288706@main) (141632782)

Deprecations

  • Removed wheel event handling for <input type="number"> to match platform conventions. (289285@main) (99318505)

Web Extensions

Resolved Issues

  • Fixed the tabs field missing from the result returned by windows.create. (288949@main) (138529797)

  • Fixed the webRequest.onBeforeRequest event missing the requestBody. (288813@main) (140338580) (FB15911234)

  • Fixed blurry extension icons. (288529@main) (142070967) (FB16171862)

  • Fixed not picking the “zh” locale when “zh-Hant” is preferred. (288974@main) (142602243) (FB16271745)

  • Fixed webRequest event listeners to honor extraInfoSpec for better performace. (288938@main) (142907168)

  • Fixed web extension resources to be treated as UTF-8 by default. (289086@main) (143079179)

Web Inspector

Resolved Issues

  • Fixed style rules to stay editable after being modified by CSSOM in JavaScript. (288948@main) (124650808)

WebRTC

Resolved Issues

  • Fixed switching from speaker to receiver does not work the first time, but only the second time. (289006@main) (141685006)

See Also

2025