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Editorial Team
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Asked: 2026-05-28T02:47:19+00:00

I have bits and pieces of CSS that use the -webkit- vendor prefix. For

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I have bits and pieces of CSS that use the -webkit- vendor prefix. For compatibility with “older” versions of Safari, I have the same rule with the -khtml- vendor prefix. I am actively uninterested in compatibility with Konqueror and other true KHTML browsers.

For example, I may have the following rules:

.menuItem {
  -khtml-user-select: none;
  -webkit-user-select: none;
}

I understand that modern WebKit browsers internally rewrite all -khtml- and -apple- rules to be -webkit- rules instead. However, that leaves me with the following question:

In what version of Safari did -webkit- become available? That is, what is the version before which Safari would completely ignore my rules?

I plan to use this information to find out whether my individual rules (such as -khtml-user-select) are actually supported by this early version of Safari.

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  1. Editorial Team
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