[Clipboard API] Write HTML document to clipboard in async method. Using DataTransfer object's setData and async clipboard write method, we are seeing interop differences in how the HTML content is sanitized and written to the clipboard. In Chromium, async clipboard write method clears the clipboard content first and then writes the payload, which results in overwriting the previous HTML content that was inserted by authors using DataTransfer object's setData API. Also, creating a fragment and inlining the styles bloats the payload and strips out the custom styles inserted by sites like Excel online that are used to preserve excel specific semantics. It'd be beneficial for the web authors if async clipboard and setData APIs provide the same HTML content during copy operation so round-tripping is possible without any interop differences. In this change we allow unsanitized HTML format to be written to the clipboard as a well-formed HTML document under the standard format when web authors provide "text/html" in the `unsanitized` list. If web authors read "text/html" format without the `unsanitized` option, then the method returns a sanitized fragment of the HTML document. Explainer: https://docs.google.com/document/d/1rTEg2I-hMPXGiLrEMqKJz2Ycu6GRjlM3uvakOe84m8Q/edit?usp=sharing Bug: 1268679 Change-Id: Ifffd83277e617d40600d357cf94cd274efe7c7b5
The web-platform-tests Project is a cross-browser test suite for the Web-platform stack. Writing tests in a way that allows them to be run in all browsers gives browser projects confidence that they are shipping software that is compatible with other implementations, and that later implementations will be compatible with their implementations. This in turn gives Web authors/developers confidence that they can actually rely on the Web platform to deliver on the promise of working across browsers and devices without needing extra layers of abstraction to paper over the gaps left by specification editors and implementors.
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