There was a lot of interest in our Why Can’t HTML Alone Do Includes? article. I’d like to point you to my ShopTalk Show conversation where we really get into things more with Jake Archibald.
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Background Patterns with CSS `corner-radius`
You might need to know this someday: you can style a div, put the div into SVG, then put the SVG in to CSS and use it as a repeating background.