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What does 100% mean in CSS?

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Turning a Fixed-Size Object into a Responsive Element

I was in a situation recently where I wanted to show an iPhone on a website. I wanted users to be able to interact with an application demo on this “mock” phone, so it had to be rendered in CSS, not an image. I found a great library called marvelapp/devices.css. The library implemented the device I needed with pure CSS, and they looked great, but there was a problem: the devices it offered were not responsive (i.e. they couldn’t … Read article “Turning a Fixed-Size Object into a Responsive Element”

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`lh` and `rlh` units

There’s some new units I was totally unaware of from the Level 4 spec for CSS values! The lh unit is “equal to the computed value of line-height” and rlh is the same only of the root element (probably the <html> element) rather than the current element.

Why would that be useful? Šime Vidas’ has a strong point:… Read article “`lh` and `rlh` units”

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Designing An Aspect Ratio Unit For CSS

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Gradians and Turns: the quiet heroes of CSS angles