Web
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box-sizing
Using universal border-box sizing. Every element will inherit the box-sizing from their parent. In case third-party components will have box-sizing: content-box, using the inherit keyword will make the conversion easier.
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Holy Grail
CSS flexbox layout
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svg – use
The <use> element takes nodes from within the SVG document, and duplicates them somewhere else. Resources MDN
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Bootstrap Sandbox
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Get style rules from stylesheet
Look into CSS style rules of this site.