onFontResize

CustomEvent : onFontResize

How it works?

1 : Create an Iframe

<iframe style="position:absolute;top:-5000px;width:100em;"></iframe>

2 : Attach onResize Event to iframe's window object

3 : When fontSize is changed, this Iframe will fire an onResize event which we can catch later.

Why using Iframe?

Because onResize event is fired by window object only on most browsers (except IE)

추측: 안보이게 iframe을 숨겨두고 font-size 변경에 따라 iframe이 바뀌는 경우 이를 처리하는게 아닌가 싶다.

출처 : CustomEvent : onFontResize