--- title: Safari Technology Preview 217 Release Notes framework: safari-technology-preview-release-notes role: article role_heading: Article path: safari-technology-preview-release-notes/stp-release-217 --- # Safari Technology Preview 217 Release Notes Learn about the latest web technology updates in Safari Technology Preview: Accessibility, CSS, Forms, JavaScript, Media, Rendering, SVG, Tables, Web API, Web Extensions, Web Inspector, and WebRTC. ## Overview Overview Safari Technology Preview Release 217 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: 292535@main…293326@main CSS Resolved Issues Fixed @scope to create a style nested context. (292821@main) (148101373) Fixed changing content-visibility from visible to hidden to repaint correctly. (292960@main) (148273903) Fixed color to not be a high-priority property. (293082@main) (148361501) Forms Resolved Issues Fixed setValidity of ElementInternals to handle missing optional anchor parameter. (292770@main) (123744294) JavaScript Resolved Issues Fixed performance of Math.hypot() that was significantly slower than Math.sqrt(). (292549@main) (141821484) Fixed Array#indexOf and Array#includes to treat +0 and -0 as the same value. (293134@main) (148472519) Media Resolved Issues Fixed subtitle tracks with no srclang to be shown with the correct label. (292577@main) (147722563) Rendering Resolved Issues Fixed the text indicator sometimes getting clipped during a bounce animation. (292612@main) (147602900) Fixed geometry values inside content-visibility: hidden subtrees. (293267@main) (148553259) Fixed not marking content-visibility: hidden content for layout when targeting content-visibility: auto. (293304@main) (148663896) SVG Resolved Issues Fixed: Improved handling of SVG images with subresources. (293259@main) (148607855) Tables Resolved Issues Fixed table layout to only be triggered when inline-size is not auto. (292536@main) (147636653) Web API New Features Added support for scrollMargin in IntersectionObserver. (293306@main) (117527880) Added support for the alg parameter when importing or exporting Edward’s-curve based JSON Web Keys in WebCrypto. (293089@main) (147323269) Web Extensions Resolved Issues Fixed "excludeMatches" array in scripting.registerContentScripts() API getting ignored in Safari web extensions. (293106@main) (145489255) (FB16590857) Web Inspector New Features Added support for exporting and importing data from worker targets in the Timelines tab. (292991@main) (145330533) Added a a badge for to quickly jump to the assigned node in the Elements tab. (292966@main) (148297936) Resolved Issues Fixed a performance issue when blackboxing a large number of sourcemaps. (292997@main) (148116377) WebRTC New Features Added support for exposing CSRC information for RTCEncodedVideoStream. (293088@main) (76548862) Added serialisation of RTCEncodedAudioFrame and RTCEncodedVideoFrame. (293185@main) (148244334) Added support for ImageCapture.grabFrame. (293243@main) (148425176) Resolved Issues Fixed enumerateDevices returning devices as available when permissions are denied. (292921@main) (147313922) Fixed getUserMedia not using the correct camera or microphone if devices change while user is answering the permission prompt. (292696@main) (147762070) Fixed enumerateDevices to not check for device permission. (293003@main) (148094614) Fixed WebRTC encoded transform to transfer to the RTC encoded frame array buffer. (293232@main) (148343876) Fixed RTC encoded frame timestamp should be persistent. (293238@main) (148580865) ## See Also ### 2025 - [Safari Technology Preview 234 Release Notes](safari-technology-preview-release-notes/stp-release-234.md) - [Safari Technology Preview 233 Release Notes](safari-technology-preview-release-notes/stp-release-233.md) - [Safari Technology Preview 232 Release Notes](safari-technology-preview-release-notes/stp-release-232.md) - [Safari Technology Preview 231 Release Notes](safari-technology-preview-release-notes/stp-release-231.md) - [Safari Technology Preview 230 Release Notes](safari-technology-preview-release-notes/stp-release-230.md) - [Safari Technology Preview 229 Release Notes](safari-technology-preview-release-notes/stp-release-229.md) - [Safari Technology Preview 228 Release Notes](safari-technology-preview-release-notes/stp-release-228.md) - [Safari Technology Preview 227 Release Notes](safari-technology-preview-release-notes/stp-release-227.md) - [Safari Technology Preview 226 Release Notes](safari-technology-preview-release-notes/stp-release-226.md) - [Safari Technology Preview 225 Release Notes](safari-technology-preview-release-notes/stp-release-225.md) - [Safari Technology Preview 224 Release Notes](safari-technology-preview-release-notes/stp-release-224.md) - [Safari Technology Preview 223 Release Notes](safari-technology-preview-release-notes/stp-release-223.md) - [Safari Technology Preview 222 Release Notes](safari-technology-preview-release-notes/stp-release-222.md) - [Safari Technology Preview 221 Release Notes](safari-technology-preview-release-notes/stp-release-221.md) - [Safari Technology Preview 220 Release Notes](safari-technology-preview-release-notes/stp-release-220.md)