Is there a list of all supported JavaScript events on the iPad Safari?
Preferably from official Apple pages.
On an iPad and an iPhone JavaScript is default disabled! When you enable JavaScript an Cookies in your Safari browser, logon will probably be successful. To enable JavaScript on your iPad or iPhone choose Settings, Safari and Advanced; to adjust Cookies choose Settings, Safari and uncheck Block Cookies.
In the Shortcuts app on your iOS or iPadOS device, tap in the upper-right corner of the screen. In the shortcut editor, tap the search field at the bottom of the screen, begin typing “Run JavaScript…” in the search field, then tap the Run JavaScript on Webpage action to add it to the shortcut editor.
On an iPhone, JavaScript should be turned on by default, but if it was disabled at some point, many websites will appear broken in the Safari browser. To enable JavaScript, go into the Settings app on your iPhone, click "Safari," then "Advanced," and swipe the JavaScript button to the right so it appears green.
It depends which version the operating system is, but here is a list of supported events under 'Supported Events'.
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