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How to get the exact WebKit version when running self-built WebKit with native Safari?

Hi all, I'm new to WebKit. I have built up the WebKit with XCode based on the document. Now I run the WebKit with native Safari.app on my Macbook, so what I understand is that it will use my self-built WebKit instead of the native one in Safari. Then how do I know that it truly do replace the default WebKit with my self-built one? I check the default Safari with "what is my user agent" in Google, it says the AppleWebKit is 605.1.15. Then I do same check to my self-built WebKit, it still shows the AppleKit is 605.1.15. So as the title goes, how do I get the exact WebKit version? Thanks
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by Miracle-.
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Does anyone know how the Instruments return the fps rate?

Hi, as the title going, does anyone know the mechanism of Instruments for returning the frame rate(in the "Core Animation" metrics)?Like from hardware side(check the screen refresh rate) or software side(check every frame execution time)? Or where could I find related info about this tools?Thanks
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by Miracle-.
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Core Animation cannot return correct FPS for benchmarks running on Mobile Safari

Hi, all, Recently I find that when I run a web Canvas2D benchmark on mobile Safari, I use Core Animation in Instruments to get the fps and gpu utilization. But from JS side, the fps of my web benchmark is about 52 fps while Core Animation just returns 12 fps at the same time. I also try it when building a native iOS app, this time Core Animation returns same FPS value compared to Xcode. So, can we use Core Animation to measure Web benchmark FPS or the mechanism of collecting FPS by Core Animation in Instruments is not designed for Web benchmarks?Thanks
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by Miracle-.
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Did iOS 12 will automatically turn OpenGL ES into Metal?

Hi, all, I'm writing my own app with OpenGL ES as my rendering backend. But I just look into the profiling data collected by instruments in Xcode, I found that there were lots of events running in Metal driver level. So does iOS 12 will automatically transfer my OpenGL ES commands into Metal commands?Thanks
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by Miracle-.
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