While libraries like jQuery help to forget most of the browser inconsistencies, you really become familiar with them once you start using plain JavaScript for everything. To avoid writing JavaScript that’s full of browser hacks and complex methods, I recommend using feature detection to only target the more modern browsers. This doesn’t mean that browsers like IE7 don’t see anything at all, it just means that they get a more basic experience without JavaScript enhancements.
Let’s start looking how the most basic and often needed functionalities work in plain JavaScript, compared to jQuery. For each example, I’m going to provide both the jQuery and plain JavaScript approach.
With jQuery, adding, removing and checking if an element has certain classes is really simple. It’s a bit more complex with plain JavaScript, but not too much so.
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