Remove beforescriptexecute/afterscriptexecute #1103
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These have failed to garner implementer interest beyond one engine. Fixes #943.
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This was a bad move. There is no alternative way of controlling script execution, it may be a niche feature, but has its purpose for user scripts, web extensions and other client-side blocking software. |
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Browsers can expose any events to user scripts and extensions. |
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In a totally unstandardized way. This is about interoperability after all. |
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In case this is revisited in the next update to the standards, one very compelling use case for the existence of this event is to enable a new class of very effective XSS mitigation techniques: https://www.researchgate.net/publication/320748079_WebMTD_Defeating_Web_Code_Injection_Attacks_using_Web_Element_Attribute_Mutation |
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These have failed to garner implementer interest beyond one engine.
Fixes #943.
I think we've given these enough of a shot. Similar to other single-vendor features (including both unloved ones, like showModalDialog, and loved ones, like MediaController) we should be removing them.
Related: #1100.