Bug 266569 – The Webkit callout bar to paste content sometimes misses the "Paste" label

• Status: NEW
• Component: HTML Editing

[Georgiana Anton]

Created attachment 469105 [details]
reproducing the issue in a isolated env

The Webkit callout bar asking user to provide their permission to paste content is sometimes missing the "Paste" label.

This issue does not reproduce consistently.

The Safari security criteria behind this callout bar are described here: https://webkit.org/blog/10855/async-clipboard-api/

"Since users may not always be aware that sensitive content has been copied to the pasteboard, restrictions on the ability to read are more strict than the restrictions on the ability to write. If a page attempts to programmatically read from the pasteboard outside of a user gesture, the promise will immediately reject. If the user is explicitly triggering a paste during the gesture (for instance, using a keyboard shortcut on macOS such as ⌘V or pasting using the “Paste” action on the callout bar on iOS), WebKit will allow the page to programmatically read the contents of the clipboard. Programmatic clipboard access is also automatically granted in the case where the contents of the system clipboard were written by a page with the same security origin. If neither of the above are true, WebKit will show platform-specific UI which the user may interact with to proceed with a paste. On iOS, this takes the form of a callout bar with a single option to paste; on macOS, it is a context menu item. Tapping or clicking anywhere in the page (or performing any other actions, such as switching tabs or hiding Safari) will cause the promise to be rejected; the page is granted programmatic access to the clipboard only if the user manually chooses to paste by interacting with the platform-specific UI."


The problem was reproduced on an iPhone simulator (iPhone 15/Safari 17) using this isolated jsbin environment: https://jsbin.com/yeputuxuvi/edit?output

[Georgiana Anton]

Created attachment 469106 [details]
reproducing the issue on iOS 17

[Radar WebKit Bug Importer]

<rdar://problem/120115810>