Icons Not Displaying and Checkbox Not Functioning Correctly in Semantic UI

[Sir0xb]

I want to use Semantic UI for UI development only. I included the following CSS link:

I encountered several issues:

1. Icons are not displaying at all.
2. The checkbox does not show the checked state, even after adding the checked class.

[Sir0xb]

It doesn't work in Chrome browser, but it works in Safari