At its core, Feather is a collection of SVG files. This means that you can use Feather icons in all the same ways you can use SVGs (e.g. img, background-image, inline, object, embed, iframe). Here's a helpful article detailing the many ways SVGs can be used on the web: SVG on the Web – Implementation Options

Also includes feather icons in font flavor. Feather font is icon font for websites. It gives you scalable vector icons that can instantly be customized -- size, color, drop shadow, and anything that can be done with the power of CSS.