Are Render and Main Thread the same thing? (WebGL)

Unity Engine
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Hi!, I would like some clarification regarding CPU Threads:

WebGL by unity doesn’t support multithreading as stated in the documentation, would that mean that the tasks of the Main Thread and Render Thread which would normally be performed in their own separated thread now would be performed by a single Thread? would that mean that all the render times the profiler is showing on the CPU are additive since a single Thread has to perform them all?

For example, if the Render Thread is 5ms and the Main Thread is 5ms would that mean 10ms because the single thread has to do both?

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Yes, the render and main thread are the same with WebGL currently.