# Safari Technology Preview 10 Release Notes Preview the latest web technology updates including: JavaScript, Web APIs, Apple Pay, Web Inspector, MathML, Rendering, Accessibility, and Security. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 10 is now [available for download](https://webkit.org/downloads/) for both macOS Sierra betas and OS X El Capitan. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. This release covers WebKit revisions [203152–203771](http://trac.webkit.org/log/?rev=203771&stop_rev=203152&limit=999). ### JavaScript - Introduced exponentiation expressions (`x ** y`) from ECMAScript 2016 ([r203499](https://trac.webkit.org/changeset/203499/)) - Improved specification compatibility of `use strict` in functions ([r203263](https://trac.webkit.org/changeset/203263/)) ### Web APIs - Moved `dir` attribute from `HTMLDocument` to `Document` ([r203761](https://trac.webkit.org/changeset/203761)) - Aligned `Node.isEqualNode()` with the specification ([r203759](https://trac.webkit.org/changeset/203759)) - Made `DOMTokenList` iterable ([r203728](https://trac.webkit.org/changeset/203728)) - Moved properties for `ClientRect` to the prototype ([r203702](https://trac.webkit.org/changeset/203702)) - Made the parameters of `DOMImplementation.createDocumentType()` mandatory and non-nullable ([r203701](https://trac.webkit.org/changeset/203701)) - Made the first parameter of `Window.getComputedStyle()` mandatory and non-nullable ([r203623](https://trac.webkit.org/changeset/203623)) - Fixed null handling of `SVGAngle.valueAsString` and `SVGLength.valueAsString ` ([r203531](https://trac.webkit.org/changeset/203531)) - Fixed null handling of `HTMLFontElement.color` ([r203530](https://trac.webkit.org/changeset/203530)) - Fixed null handling for several `HTMLTableElement` attributes ([r203529](https://trac.webkit.org/changeset/203529)) - Fixed null handling for `HTMLObjectElement.border` ([r203528](https://trac.webkit.org/changeset/203528)) - Fixed null handling for `td.bgColor` and `tr.bgColor` ([r203527](https://trac.webkit.org/changeset/203527)) - Fixed null handling for several `HTMLBodyElement` attributes ([r203525](https://trac.webkit.org/changeset/203525)) - Fixed null handling of the `marginWidth` and `marginHeight` attributes for `HTMLFrameElement` and `HTMLIFrameElement` ([r203474](https://trac.webkit.org/changeset/203474), [r203524](https://trac.webkit.org/changeset/203524)) - Fixed null handling for `HTMLImageElement.border` ([r203523](https://trac.webkit.org/changeset/203523)) - Fixed null handling of several `Document` attributes ([r203487](https://trac.webkit.org/changeset/203487)) - Fixed null handling of `HTMLMediaElement.mediaGroup` ([r203463](https://trac.webkit.org/changeset/203463)) - Fixed null handling of `HTMLSelectElement.value` attribute ([r203456](https://trac.webkit.org/changeset/203456)) - Fixed null handling of `SVGScriptElement.type` attribute ([r203444](https://trac.webkit.org/changeset/203444)) - Fixed null handling of several `HTMLDocument` attributes ([r203443](https://trac.webkit.org/changeset/203443)) - Fixed null handling of `HTMLScriptElement.text` attribute ([r203428](https://trac.webkit.org/changeset/203428)) - Fixed null handling of the `enctype`, `encoding` and `method` properties of the `form` element ([r203401](https://trac.webkit.org/changeset/203401)) - Fixed null handling of `formEnctype` and `formMethod` properties for `input` and `button` elements ([r203394](https://trac.webkit.org/changeset/203394)) - Changed the letter-case for the `playsInline` IDL attribute ([r203511](https://trac.webkit.org/changeset/203511)) - Dropped the `SVGElement.xmlbase` attribute ([r203438](https://trac.webkit.org/changeset/203438)) - Aligned `CSSStyleDeclaration.setProperty()` with the specification ([r203437](https://trac.webkit.org/changeset/203437)) - Made the `EventTarget.dispatchEvent()` parameter non-nullable ([r203391](https://trac.webkit.org/changeset/203391)) ### Apple Pay - Fixed deprecated errors thrown when using `requiredBillingAddressFields` ([r203168](https://trac.webkit.org/changeset/203168/)) - Fixed `onPaymentAuthorized` callback not received when authorizing a second time ([r203746](https://trac.webkit.org/changeset/203746/)) - Fixed ending the payment session if the user closes all windows ([r203741](https://trac.webkit.org/changeset/203741/)) ### Web Inspector - Fixed slowdowns when switching away from the Console tab with a lot of messages ([r203636](https://trac.webkit.org/changeset/203636/)) - Fixed filtering in the Overview timeline view ([r203673](https://trac.webkit.org/changeset/203673/)) - Fixed maintaining the selected function when switching between different profile representations ([r203243](https://trac.webkit.org/changeset/203243/)) - Improved styles for the Open Quickly and Goto Line dialogs ([r203290](https://trac.webkit.org/changeset/203290/)) ### MathML - Changed the CSS `display` property of many MathML elements to allow page authors to override ([r203163](https://trac.webkit.org/changeset/203163/)) - Mapped “combining” to “non-combining” character equivalents ([r203714](https://trac.webkit.org/changeset/203714/)) - Improved alignment inside vertically stretched operators ([r203289](https://trac.webkit.org/changeset/203289/)) - Removed the padding and margin around the `$` element ([r203171](https://trac.webkit.org/changeset/203171/)) - Reset the `font-style` property on the `` element ([r203640](https://trac.webkit.org/changeset/203640/)) ### Rendering - Added support for new emoji group candidates ([r203330](https://trac.webkit.org/changeset/203330/), [r203533](https://trac.webkit.org/changeset/203533/), [r203626](https://trac.webkit.org/changeset/203626/)) - Fixed moving scrollbars to the right when the text direction changes to right-to-left ([r203267](https://trac.webkit.org/changeset/203267/)) - Fixed image zoom animations that were broken on [medium.com](http://medium.com/) ([r203380](https://trac.webkit.org/changeset/203380/)) - Fixed computing elements-based snap points for containers with large maximum scroll offset values ([r203684](https://trac.webkit.org/changeset/203684/)) - Fixed a rendering issue causing theguardian.co.uk crossword puzzles to sometimes not display text ([r203415](https://trac.webkit.org/changeset/203415/)) ### Accessibility - Fixed an issue causing duplicate children when `first-letter` is being used in CSS ([r203694](https://trac.webkit.org/changeset/203694/)) - Fixed name calculation of headings from the `aria-label` attribute for VoiceOver ([r203538](https://trac.webkit.org/changeset/203538/)) - Added a new attribute to expose the `auto-fill` button type to VoiceOver ([r203711](https://trac.webkit.org/changeset/203711/)) - Fixed volume adjustments using VoiceOver and improved spoken feedback ([r203669](https://trac.webkit.org/changeset/203669/)) ### Security - Changed behavior to block insecure scripts running in a `data: frame` when the top-level page is HTTPS ([r203300](https://trac.webkit.org/changeset/203300/)) - Changed URL handling to remove credentials when accessed through `location.href` ([r203258](https://trac.webkit.org/changeset/203258/)) - Changed behavior to block mixed-content synchronous XHRs ([r203542](https://trac.webkit.org/changeset/203542/)) - Improved support for multiple policies to more closely conform to the CSP Level 2 specifications ([r203434](https://trac.webkit.org/changeset/203434/)) - Applied the Content Security Policy object-src and plugin-types directives for plugin replacements ([r203611](https://trac.webkit.org/changeset/203611/)) - Changed the behavior to prevent history.pushState and history.replaceState where a username is in the URL ([r203288](https://trac.webkit.org/changeset/203288/)) - Changed behavior to allow LocalStorage access for file URLs by default ([r203695](https://trac.webkit.org/changeset/203695/)) --- Copyright © 2026 Apple Inc. 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