Basic Use
You can place Font Awesome icons just about anywhere using a CSS style prefix and the icon’s name. Font Awesome is designed to be used with inline elements (we like the <i> tag for brevity, but using a <span> is more semantically correct).
使用<span>更語意化。
Stacked Icons
To stack multiple icons, use the fa-stack class on the parent, the fa-stack-1x for the regularly sized icon, and fa-stack-2x for the larger icon. fa-inverse can be used as an alternative icon color. You can even throw larger icon classes on the parent to get further control of sizing.
fa-stack用在父層上面，fa-stack-1x用在一般尺寸的icon，fa-stack-2x用在大一點的icon ，fa-inverse用在反白的icon。
例如：
fa-circle代表圓的圖案
fa-stack-2x是用在底圖的圓
font awesome 5把舊的fa前綴詞改成新的fas for solid和fab for brand, far for regular了。
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