paris-web.fr/2013/conferences/wcag-412-understanding-dom-and-its-importance-for-accessibility-1.php

As web developers we like to think that our hard work creating HTML, CSS, and JavaScript is what makes our sites so great, but the reality is that all our hard work is really just a request that says “Please, Mr. Browser, can you make this website do all the cool stuff I’ve designed here?” At the time the user’s browser actually receives your web page and all of its assets, your control of the situation entirely ceases and control for how your site really looks and operates is entirely in the hands of the browser.

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