Most references as below mention that Safari partially supports web components.
In detail, what web component features are not supported by Safari desktop and Safari iOS?
Is there a technical docs or specs about the issue?
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Burn all old blogs!
Apple Safari supports Web Components, apart from Customized Built-In Elements.
After an ongoing debate since 2013, nearly everyone, who understand what OOP means, agrees Apple engineers are right on this one.
Customized Built-In Elements
extend from any existing HTML Element:<p>, <input>, etc..If you want to understand the Apple Why,
read back in time to early December 2013 - Yes! Web Components are not a new fad!Autonomous Elements (extend from
HTMLElement)
work 100% in all Modern BrowsersFor Framework compatibility see: https://custom-elements-everywhere.com/
(React is the odd one out)
Deep dive into Web Components, React & Lit like BaseClasses:
Main differences between lit-element Web Components & React
Danny '365CSI' Engelman
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Javascript regexp variable length lookbehind is not supported by Safari but works in Chrome, Edge and Firefox. Maybe international agreements/standards say Safari doesn't need to support it (yet) but it's a pain nonetheless.
LindenRowland
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Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Jun 24 '22 at 13:12
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The forum post (see below) on the Apple Developer website has both requests to support customized built-in elements and formAssociated custom elements.
https://developer.apple.com/forums/thread/682165
It could be used to follow up onto when Apple will release support for those features on Safari.
Amjad Abujamous
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