October 2019
Intermediate to advanced
1200 pages
31h 31m
English
Content preview from Professional JavaScript for Web Developers, 4th Edition
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20JavaScript APIs
WHAT'S IN THIS CHAPTER?
- Atomics and SharedArrayBuffer
- Cross-context messaging
- Encoding API
- File and Blob API
- Drag and drop
- Notifications API
- Page Visibility API
- Streams API
- Timing APIs
- Web components
- Web Cryptography API
The increasing versatility of web browsers is accompanied by a dizzying increase in complexity. In many ways, the modern web browser has become a Swiss army knife of different APIs detailed in a broad collection of specifications. This browser specification ecosystem is messy and volatile. Some specifications like HTML5 are a bundle of APIs and browser features that enhance an existing standard. Other specifications define an API for a single feature, such as the Web Cryptography API or the Notifications API. Depending on the browser, adoption of these newer APIs can sometimes be partial or nonexistent.
Ultimately, the decision to use newer APIs involves a tradeoff between supporting more browsers and enabling more modern features. Some APIs can be emulated using a polyfill, but polyfills can often incur a performance hit or bloat your site's JS payloads.
ATOMICS AND SharedArrayBuffer
When a SharedArrayBuffer is accessed by multiple contexts, race conditions can occur ...
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