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Custom iOS UI Element via HTML or Javascript?

On an iPad, if you are on a web page, and select a block of text, a menu bar appears with a few options Copy | Select All | Define ...

Does anyone know how do add custom options to this menu, via HTML or javascript?

You can't. To see what extensions Mobile Safari makes available to Web content, check out the Safari Web Content Guide on Apple's developer site.

https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/Introduction/Introduction.html

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