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Explainer https://github.com/w3c/editing/blob/gh-pages/docs/clipboard-unsanitized/explainer.md Specification https://github.com/w3c/editing/blob/gh-pages/docs/clipboard-unsanitized/explainer.md Summary This proposal provides an `unsanitized` option in read() method to get the unsanitized HTML format. Unless sites explicitly opt-into reading the unsanitized HTML, they will get the sanitized HTML content by-default. Currently, when we read text/html MIME type using the async API, the sanitizer is invoked to strip out contents from the HTML markup due to security concerns, and styles are inlined into the HTML markup, which leads to a bloated HTML payload and loss of fidelity of HTML content when read by web authors or native apps. Firefox provides access to unsanitized HTML via DataTransfer APIs, which matches Chromium's behavior, and Safari only allows access to unsanitized HTML if it's being read within the same origin. Comments For more context on this change, here is a discussion between stakeholders: https://docs.google.com/document/d/1ha0pcpQsEgVGtPK8dd8N_0P1ynI7rXV7bR5ZFmOTD6Y/edit?usp=sharing Blink component Blink>DataTransfer<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EDataTransfer> Search tags unsanitized html<https://chromestatus.com/features#tags:unsanitized%20html>, async api<https://chromestatus.com/features#tags:async%20api>, clipboard<https://chromestatus.com/features#tags:clipboard> TAG review There is no desire to standardize this behavior as discussed in https://github.com/w3c/clipboard-apis/issues/150#issuecomment-917273986. Also, Webkit was opposed to any change in behavior since their implementation of Async API interops with the DataTransfer API (https://github.com/w3c/clipboard-apis/issues/165#issuecomment-1047152542). TAG review status Not applicable WebFeature UseCounter name AsyncClipboardAPIUnsanitizedRead Risks Interoperability and Compatibility This is a Chromium-only feature (see discussion in https://docs.google.com/document/d/1ha0pcpQsEgVGtPK8dd8N_0P1ynI7rXV7bR5ZFmOTD6Y/edit?usp=sharing), so adding a dictionary as an argument in read will be ignored in non-Chromium browsers and the HTML read might be sanitized. As this change aligns the sanitization behavior of the DataTransfer API and the Clipboard Async API, existing paste targets that support DataTransfer APIs unsanitized HTML don't need to make updates on how they handle HTML if they decide to transition to the Clipboard Async API. Gecko: Neutral (https://github.com/mozilla/standards-positions/issues/769) https://github.com/w3c/clipboard-apis/issues/150#issuecomment-1031684598 WebKit: Negative (https://github.com/w3c/clipboard-apis/issues/150#issuecomment-974236367) Web developers: Positive. Positive signals from Excel Online, https://groups.google.com/a/chromium.org/g/blink-dev/c/j9fDbU9E2Ds/m/IPocqIfEAwAJ?utm_medium=email&utm_source=footer Ergonomics The spec'd read method doesn't accept any arguments. With this feature, we have overloaded the read method in order to add a dictionary argument, where web authors will explicitly request for the unsanitized HTML format. Activation The current Clipboard Async API read method as specified in https://w3c.github.io/clipboard-apis/ isn't affected by the introduction of this feature, the behavior is validated through existing web tests. Security Sites have to explicitly opt into reading unsanitized HTML content via the "unsanitized" option, so any sites that don't have that option, would get the default, sanitized HTML content. The legacy DataTransfer APIs already allow access to unsanitized HTML content, so we don't think this will create any additional security loopholes. Threat Model document: https://docs.google.com/document/d/1QLt50Q8UnlQksVltZ2PNkDZVdk9N58Pq7P0lzGTKh-U/edit?usp=sharing WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? No. Ergonomics N/A Activation N/A Security N/A WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? N/A Debuggability No specific DevTools changes are required. This feature is treated like any other JS method. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)? Yes Is this feature fully tested by web-platform-tests<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>? Yes Flag name on chrome://flags ClipboardUnsanitizedContent Finch feature name None Non-finch justification None Requires code in //chrome? False Tracking bug https://bugs.chromium.org/p/chromium/issues/detail?id=1268679 Measurement Added usage metrics: ClipboardUnsanitizedContent Adoption expectation Excel online is ready to use this API. They are trying to move away from DataTransfer APIs and use Async clipboard APIs where web custom format is supported along with other benefits from async usage. Adoption plan Support for async clipboard API and web custom format is already in inner rings, so once this gets added to the clipboard API, Excel would be ready to use it right away. Sample links https://viridian-hypnotic-cut.glitch.me/ Estimated milestones Shipping on desktop 120 Shipping on Android 120 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5716132676763648 This intent message was generated by Chrome Platform Status<https://chromestatus.com/>. 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