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I think the problem is the id (darkBtn and lightBtn) is missing from home page and only exist on inner page. So, I added the id to home page too, and all fixed. Thanks for all your suggestion here. It really helps a lot.
webpagetest.org/result/190929_8W_f...
I think the problem is the id (darkBtn and lightBtn) is missing from home page and only exist on inner page. So, I added the id to home page too, and all fixed. Thanks for all your suggestion here. It really helps a lot.
webpagetest.org/result/190929_8W_f...