
Pressing the shift key when launching Safari simply prevents it from loading its last saved application state, and does not clear any caches. In searching the forums, I did find this post from where VikingOSX gave the following fix.

The test runs fine on Firefox so it's definitely a Safari problem. If possible, please ensure that you are running the latest drivers for your video card.

While your browser seems to support WebGL, it is disabled or unavailable. I have confirmed that WebGL is enabled under the Developer - Experimental features list but when I run a test from I get the following error: I'm running Big Sur 11.6.1 but have had this problem for quite some time. I need some help from the community on getting WebGL to run on Safari on my Mac.

WebGL not on working on Safari on Mac works on other browsers.
