Browser bugs

Bootstrap currently works around several outstanding browser bugs in major browsers to deliver the best cross-browser experience possible. Some bugs, like those listed below, cannot be solved by us.

We publicly list browser bugs that are impacting us here, in the hopes of expediting the process of fixing them. For information on Bootstrap's browser compatibility, see our browser compatibility docs.

See also:

Browser(s) Summary of bug Upstream bug(s) Bootstrap issue(s)
Microsoft Edge

Native browser tooltip for title shows on first keyboard focus (in addition to custom tooltip component)

 Edge issue #6793560 #18692
Microsoft Edge

Hovered element still remains in :hover state after scrolling away.

 Edge issue #5381673 #14211
Microsoft Edge

When hovering over a <select> menu item, the cursor for the element underneath the menu is displayed.

 Edge issue #817822 #14528
Microsoft Edge

CSS border-radius sometimes causes lines of bleed-through of the background-color of the parent element.

 Edge issue #3342037 #16671
Microsoft Edge

background of <tr> is only applied to first child cell instead of all cells in the row

 Edge issue #5865620 #18504
Microsoft Edge

@-ms-viewport{width: device-width;} has side-effect of making scrollbars auto-hide

 Edge issue #7165383 #18543
Microsoft Edge

Background color from lower layer bleeds through transparent border in some cases

 Edge issue #6274505 #18228
Microsoft Edge

Hovering over descendant SVG element fires mouseleave event at ancestor

 Edge issue #7787318 #19670
Firefox

.table-bordered with an empty <tbody> is missing borders.

 Mozilla bug #1023761 #13453
Firefox

If the disabled state of a form control is changed via JavaScript, the normal state doesn’t return after refreshing the page.

 Mozilla bug #654072 #793
Firefox

focus events should not be fired at the document object

 Mozilla bug #1228802 #18365
Firefox

Wide floated table doesn’t wrap onto new line

 Mozilla bug #1277782 #19839
Firefox

Mouse sometimes not within element for purposes of mouseenter/mouseleave when it’s within SVG elements

 Mozilla bug #577785 #19670
Firefox

position: absolute element that’s wider than its column renders differently than other browsers

 Mozilla bug #1282363 #20161
Firefox (Windows)

Right border of <select> menu is sometimes missing when screen is set to uncommon resolution

 Mozilla bug #545685 #15990
Firefox (OS X & Linux)

Badge widget causes bottom border of Tabs widget to unexpectedly not overlap

 Mozilla bug #1259972 #19626
Chrome (Android)

Tapping on an <input> in a scrollable overlay doesn’t scroll the <input> into view

 Chromium issue #595210 #17338
Chrome (OS X)

Clicking above <input type="number"> increment button flashes the decrement button.

 Chromium issue #419108 Offshoot of #8350 & Chromium issue #337668
Chrome

CSS infinite linear animation with alpha transparency leaks memory.

 Chromium issue #429375 #14409
Chrome

:focus outline style causes cursor to not be displayed when toggling a readonly <input> to read-write.

 Chromium issue #465274 #16022
Chrome

table-cell borders not overlapping despite margin-right: -1px

 Chromium issue #534750 #17438, #14237
Chrome

Clicking scrollbar in <select multiple> with overflowed options will select nearby <option>

 Chromium issue #597642 #19810
Chrome

Don’t make :hover sticky on touch-friendly webpages

 Chromium issue #370155 #12832
Chrome (Windows & Linux)

Animation glitch when returning to inactive tab after animations occurred while tab was hidden.

 Chromium issue #449180 #15298
Safari

rem units in media queries should be calculated using font-size: initial, not the root element’s font-size

 WebKit bug #156684 #17403
Safari (OS X)

px, em, and rem should all behave the same in media queries when page zoom is applied

 WebKit bug #156687 #17403
Safari (OS X)

Weird button behavior with some <input type="number"> elements.

 WebKit bug #137269, Apple Safari Radar #18834768 #8350, Normalize #283, Chromium issue #337668
Safari (OS X)

Small font size when printing webpage with fixed-width .container.

 WebKit bug #138192, Apple Safari Radar #19435018 #14868
Safari (iPad)

<select> menu on iPad causes shifting of hit-testing areas

 WebKit bug #150079, Apple Safari Radar #23082521 #14975
Safari (iOS)

transform: translate3d(0,0,0); rendering bug.

 WebKit bug #138162, Apple Safari Radar #18804973 #14603
Safari (iOS)

Text input’s cursor doesn’t move while scrolling the page.

 WebKit bug #138201, Apple Safari Radar #18819624 #14708
Safari (iOS)

Can’t move cursor to start of text after entering long string of text into <input type="text">

 WebKit bug #148061, Apple Safari Radar #22299624 #16988
Safari (iOS)

display: block causes text of temporal <input>s to become vertically misaligned

 WebKit bug #139848, Apple Safari Radar #19434878 #11266, #13098
Safari (iOS)

Tapping on <body> doesn’t fire click events

 WebKit bug #151933 #16028
Safari (iOS)

position:fixed is incorrectly positioned when tab bar is visible on iPhone 6S+ Safari

 WebKit bug #153056 #18859
Safari (iOS)

Tapping into an <input> within a position:fixed element scrolls to the top of the page

 WebKit bug #153224, Apple Safari Radar #24235301 #17497
Safari (iOS)

<body> with overflow:hidden CSS is scrollable on iOS

 WebKit bug #153852 #14839
Safari (iOS)

Scroll gesture in text field in position:fixed element sometimes scrolls <body> instead of scrollable ancestor

 WebKit bug #153856 #14839
Safari (iOS)

Tapping from one <input> to another in an overlay can cause shaking/jiggling effect

 WebKit bug #158276 #19927
Safari (iOS)

Modal with -webkit-overflow-scrolling: touch doesn’t become scrollable after added text makes it taller

 WebKit bug #158342 #17695
Safari (iOS)

Don’t make :hover sticky on touch-friendly webpages

 WebKit bug #158517 #12832
Safari (iPad Pro)

Rendering of descendants of position: fixed element gets clipped on iPad Pro in Landscape orientation

 WebKit bug #152637, Apple Safari Radar #24030853 #18738

Most wanted features

There are several features specified in Web standards which would allow us to make Bootstrap more robust, elegant, or performant, but aren't yet implemented in certain browsers, thus preventing us from taking advantage of them.

We publicly list these "most wanted" feature requests here, in the hopes of expediting the process of getting them implemented.

Browser(s) Summary of feature Upstream issue(s) Bootstrap issue(s)
Microsoft Edge

Implement the :dir() pseudo-class from Selectors Level 4

 Edge UserVoice idea #12299532 #19984
Microsoft Edge

Implement sticky positioning from CSS Positioned Layout Level 3

 Edge UserVoice idea #6263621 #17021
Firefox

Fire a transitioncancel event when a CSS transition is canceled

 Mozilla bug #1264125 Mozilla bug #1182856
Firefox

Implement the of <selector-list> clause of the :nth-child() pseudo-class

 Mozilla bug #854148 #20143
Firefox

Implement the HTML5 <dialog> element

 Mozilla bug #840640 #20175
Chrome

Implement the of <selector-list> clause of the :nth-child() pseudo-class

 Chromium issue #304163 #20143
Chrome

Implement the :dir() pseudo-class from Selectors Level 4

 Chromium issue #576815 #19984
Chrome

Implement sticky positioning from CSS Positioned Layout Level 3

 Chromium issue #231752 #17021
Safari

Implement the :dir() pseudo-class from Selectors Level 4

 WebKit bug #64861 #19984
Safari

Implement the HTML5 <dialog> element

 WebKit bug #84635 #20175