A key advantage to using icons over images is the ability to change the size and color on the fly, like this:
cloud favorite attachment computer
You simply specify the color using span class (noted via on page style or an external stylesheet):
<span class="blood"><i class="material-icons">favorite</i> </span>
SVGs also offer the flexibility of changing size and color and with SVGs, you aren't limited to the icons in the toolset above. A tutorial is forthcoming.
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With all FontAwesome Icons, we can increase the size of the icons and/or spin 'em!
Or a ball bounce
Or make a heartbeat...
Or heart burst...
Call attention to something important...
Or ask for a review...