These validation warnings don’t matter in practice since the non-hacky portion of our CSS does fully validate and the hacky portions don’t interfere with the proper functioning of the non-hacky portion, hence why we deliberately ignore these particular warnings. In a couple places, we also use bleeding-edge CSS features that aren’t yet fully standardized, but these are used purely for progressive enhancement. These hacks understandably cause CSS validators to complain that they are invalid.

In order to provide the best possible experience to old and buggy browsers, Bootstrap uses CSS browser hacks in several places to target special CSS to certain browser versions in order to work around bugs in the browsers themselves.

However, we tend to ignore these as they often have no direct solution other than hacky workarounds. Depending on the issue, we may be able to fix it (search first and then open an issue if need be). Page zooming inevitably presents rendering artifacts in some components, both in Bootstrap and the rest of the web.

Thus, to close dropdowns in navbars, you must directly click the dropdown element (or any other element which will fire a click event in iOS). dropdown-backdrop element isn’t used on iOS in the nav because of the complexity of z-indexing. iOS text fields and scrollingĪs of iOS 9.2, while a modal is open, if the initial touch of a scroll gesture is within the boundary of a textual or a, the content underneath the modal will be scrolled instead of the modal itself. See Chrome bug #175502 (fixed in Chrome v40) and WebKit bug #153852. To that end, when you scroll past the top or bottom of a modal in either of those devices' browsers, the content will begin to scroll. Not Explorer element is quite limited in iOS and Android.

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