March 2017
Intermediate to advanced
821 pages
18h 21m
English
Content preview from JavaScript: Moving to ES2015Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Understanding the rem and em CSS units
Bootstrap 4 has switched from px to rem and em wherever possible. This is the main reason why Bootstrap 4 is not supported in IE 8 as IE 8 doesn't support the em and rem units. Bootstrap 4 switched to rem and em because they make responsive typography and component sizing easier.
If you are not familiar with the rem and em CSS units, then it's the right time to learn it.
The em unit is relative to the font size of the parent element. 1em is equal to the current font size of the parent element. 2em means two times the size of the current font. For example, if an element is displayed with a font size of 10 px, then 2em is 20 px. We can achieve responsive typography and components by just changing the parent element's ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.