# Safari Technology Preview 18 Release Notes Preview the latest web technology updates including: Input Events, JavaScript, Shadow DOM, Web Inspector, CSS, Rendering, Indexed Database 2.0, Accessibility, Printing, HTTP Authentication, and Web APIs. ## Overview [Safari Technology Preview Release 18](https://webkit.org/blog/6017/introducing-safari-technology-preview/) is now [available for download](https://webkit.org/downloads/) for macOS Sierra. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. This release covers WebKit revisions [208261–208427](https://trac.webkit.org/log/?stop_rev=208261&rev=208427&limit=999). ### Input Events - Turned on the Input Events experimental feature by default ([r208266](https://trac.webkit.org/changeset/208266/trunk/Source)) ### JavaScript - Fixed an issue where exception descriptions didn’t know how to handle Symbol values ([r208410](https://trac.webkit.org/changeset/208410/trunk/Source)) ### Shadow DOM - Added support for loading stylesheets for link elements that are inside Shadow DOM trees ([r208302](https://trac.webkit.org/changeset/208302/trunk/Source), [r208403](https://trac.webkit.org/changeset/208403)) ### Web Inspector - Added support for pausing, stepping and debugging Web Workers in the Debugger tab ([r208304](https://trac.webkit.org/changeset/208304/trunk/Source)) - Fixed creating a new pseudo-selector in the Styles sidebar when it doesn’t work on the first attempt ([r208270](https://trac.webkit.org/changeset/208270/trunk/Source)) - Fixed a stack overflow when searching a timeline recording for JavaScript function names ([r208348](https://trac.webkit.org/changeset/208348/trunk/Source)) ### CSS - Changed how `minmax(auto, )` should be serialized per the CSS Grid spec ([r208277](https://trac.webkit.org/changeset/208277/trunk/Source)) - Fixed `CSS.supports("font-variation-settings", "'wght' 500")` so it does not erroneously return `false` ([r208321](https://trac.webkit.org/changeset/208321/trunk/Source)) - Fixed filter functions `grayscale()`, `invert()`, `opacity()`, and `sepia()` so they clamp values over 100% ([r208294](https://trac.webkit.org/changeset/208294/trunk/Source)) - Fixed the `slotted()` pseudo selector so that it works with id selectors ([r208390](https://trac.webkit.org/changeset/208390)) ### Rendering - Fixed a bug where Safari does not emit `compositionend` if blurred for dead key or Japanese IME ([r208406](https://trac.webkit.org/changeset/208406/trunk/Source)) ### Indexed Database 2.0 - Changed `IDBIndex` to handle rename behavior properly when version change transaction aborts ([r208380](https://trac.webkit.org/changeset/208380/trunk/Source)) - Changed `IDBObjectStore` to handle rename behavior properly when version change transaction aborts ([r208389](https://trac.webkit.org/changeset/208389/trunk/Source)) - Renamed `IDBKeyRange.contains()` to `IDBKeyRange.includes()` ([r208359](https://trac.webkit.org/changeset/208359/trunk/Source)) - Added support for binary keys ([r208349](https://trac.webkit.org/changeset/208349/trunk/Source)) - Added support for `IDBIndex.getAll()` and `IDBIndex.getAllKeys()` ([r208261](https://trac.webkit.org/changeset/208261/trunk/Source)) - Corrected which exceptions are thrown during `IDBObjectStore` and `IDBIndex` renaming ([r208383](https://trac.webkit.org/changeset/208383/trunk/Source)) ### Accessibility - Fixed a crash that would happen when attempting to clear selection on ARIA listboxes ([r208384](https://trac.webkit.org/changeset/208384/trunk/Source)) ### Printing - Made printing to PDF produce internal links when the HTML has internal links ([r208347](https://trac.webkit.org/changeset/208347/trunk/Source)) ### HTTP Authentication - Changed Safari’s HTTP authentication UI to not block switching tabs, navigating to other websites, or closing tabs ### Web APIs - Changed `resizeTo`, `resizeBy`, `moveTo`, or `moveBy` to do nothing in windows that weren’t created by `window.open` - Implemented new user interface for HTML interactive form validation behind an experimental flag --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)