Font Awesome icons in CSS with 2.3

[Mr Lucky]

Chris D said:
You will need to look into how we add icons to templates and use that approach,
Click to expand...

Is there any documentation available on this, especially re using in CSS?

For example previously I add category icons using before pseudo elements in extra.less:

Code:

.block.block--category.block--category28 .block-header:before {
    .m-faBase();
    content: '\f001';
    float: left;
    padding-right: 5px;
}

How would I do that now?
Font Awesome icons in CSS with 2.3

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