Answer 1

@Niush is correct. When a custom font was used the browser will look for corresponding font in the device.

If it was not installed then the default font will rendered. One common way to deliver font custom font online would be using the WOFF standard.

By the way, HTML5 allows us to serve TTF files too. You may check the installed font in your PC then upload it and serve on your page. However, don't do this for commercial sites if you're unsure about its font license. 😉