Imagine the web is different in these ways:<p>* instead of a handful of desktop browsers, there are over a dozen, each with their own quirks, most stuck with support for standards over 10 years old.<p>* similarly, mobile has the problems it has now (have you ever tried tracking down an Android rendering bug?). But a few more browsers to reckon with on top of the profusion of screen resolution&#x2F;OS&#x2F;browser combinations.<p>* Most ISPs run HTTP requests through proxies which each strips out their own set of tags, CSS, and JS they&#x27;ve decided are unsafe or unhelpful. This set is different by ISP, but you have to assume your page request could go through any of them.<p>Bootstrap probably wasn&#x27;t built for that.