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Did I read that not carefully enough, or did the article really not explain what that "vw" unit is/stands for?

And what does the "calc(33vw - 100px)" do, apparently in void context?

Somehow I feel more confused after reading the article.




I believe it stands for "viewport width" which is specified in percents over the width of the browser viewport.

Google has a first-class definition, too: https://www.google.com/search?q=css+vw+unit


The `vw` unit is unrelated to responsive images but a new unit type that reflects the Viewport Width (100vw = 100% of browser’s viewport). There’s also a not so good supported vh unit, all specified under CSS Values and Units Module Level 3 (http://www.w3.org/TR/css3-values/).

The `calc()` function is a CSS function that lets you calculate values like 100vw - 100px, similar to what you can do in JavaScript. See more: https://developer.mozilla.org/en-US/docs/Web/CSS/calc




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