Which WebKit feature flags should I turn off on iPhone?

WebKit Feature Flags Which Ones To Turn Off

[Re-Titled by Moderator]

iPhone 13, iOS 18

Posted on May 28, 2025 5:04 PM

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Lawrence Finch

Community+ 2026

Level 10

230,730 points

Posted on May 28, 2025 5:48 PM

None of them, if you want browsers to work on your iPhone. Scroll to the bottom and tap Reset All to Defaults.

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What are webkit feature flags on iPhone? What are webKit feature flags? [Re-Titled by Moderator]
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Safari Webkit Feature Flags On my iPhone, at SETTINGS>SAFARI>FEATURE FLAGS>WEBKIT FEATURE FLAGS there are various things, written in Geek, some turned on, some turned off. I have looked online, including in the Apple Forum, trying to find out what these are for. All I can find are two things: 1) reference to a no-longer-included Experimental Apps menu; and 2) instructions for developers. (Note to Apple: Don't include a typical form-letter-like answer that has no relevance to my query, please. Does anybody actually read the questions, or do they all go to either AI or some person in India who has to use a script?) My first guess is that the purpose of these "flags" is to let me know if apps within various categories--which, I presume I would choose to be informed of by choosing <On>--are being experimented with and are available to try. Personally, I would never do that, as something might get screwed-up, or there might be some security risk; so, I would just turn them all off, as they would serve me no purpose. BUT, if my assumption is wrong, is there a reason why what appears to be the default settings are best, or why I might want to change them (ironically, when I clicked on the search suggestion about that, I got the same above-mentioned useless search results as when I searched "iphone webkit feature flags", nothing about which flags to switch on or off)?
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WebKit feature flags :What webkit feature flags do I need on my iPhone? I was trying to stop tracking and cookies and turned off feature flags. Now I can’t retrieve sites sent in messages! I was trying to remove cookies and tracking and turned off WebKit feature flags. Now I’m having trouble retrieving sites from the web. So I must need some of those feature flags. I have no idea what they do!
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1 reply

Top-ranking reply

Lawrence Finch

Community+ 2026

Level 10

230,730 points

May 28, 2025 5:48 PM in response to wider65

None of them, if you want browsers to work on your iPhone. Scroll to the bottom and tap Reset All to Defaults.

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Which WebKit feature flags should I turn off on iPhone?

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