December 2015
Intermediate to advanced
240 pages
4h 57m
English
Content preview from Test-Driven JavaScript DevelopmentBecome 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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Browser detection
An ideal way to develop a system is to perform capability testing first. We should get the information if the environment where the system will run is capable of doing things we want to do. But that hardly happens, and at the same time it is not always possible, be it any reason—unforeseen issues, changing requirements, insufficient time, and many more. That's one big reason we need browser detection and perform quick fixes.
User agent sniffing
Browser detection is mostly done by checking user agent string, which is not completely reliable because user agent string can be spoofed. A developer is encouraged to use feature detection over browser detection. You should not rely on browser detection to assume that a feature will be ...
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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.