set font-display property #6
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I set font-display: block; into feathericon's @font-face.
Background
I found that feathericon-sass's file loading is costing time a little.
Google introduces the way to shorten font loading time by setting font-display property into @font-face,
so I suggest to introduce this solution into feathericon.
Here is the reference about it.
How to avoid showing invisible text | google web.dev
Supplement
The documentation above introduces font-display: swap; as a solution for text font, by displaying alternative font during loading.
However, in the case of icon font, which has no alternative font, font-display: block; is the optimal solution. It displays blanc object during loading.
Reference: font-display #the_font_display_timeline | MDN
For your refference, other open source icon font FontAwesome adopts font-display: block; , too.
https://github.com/FortAwesome/Font-Awesome/blob/fcec2d1b01ff069ac10500ac42e4478d20d21f4c/css/all.css#L4590