Writing forward-compatible websites - Developer guides | MDN
This page explains how to write websites that do not break when new browser versions are released. This is especially important for intranets and other non-public websites; if we can't see your code, we can't see that it broke. It's not always possible to follow all of these, but following as many of them as possible will help future-proof your website. JavaScript Prefix all global variable access
Detecting HTML5 Features - Dive Into HTML5
Diving In You may well ask: “How can I start using HTML5 if older browsers don’t support it?” But the question itself is misleading. HTML5 is not one big thing; it is a collection of individual features. So you can’t detect “HTML5 support,” because that doesn’t make any sense. But you can detect support for individual features, like canvas, video, or geolocation. Detection Techniques When your bro
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