Wall of browser bugs

Melodic 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 inherited this list from Bootstrap, and will update it accordingly as these bugs are squashed. For information on Melodic’s browser compatibility, see our browser compatibility docs.

See also:

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

Visual artifacts in scrollable modal dialogs

 Edge issue #9011176 #20755
Edge

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

 Edge issue #6793560 #18692
Edge

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

 Edge issue #5381673 #14211
Edge

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

 Edge issue #3342037 #16671
Edge

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

 Edge issue #5865620 #18504
Edge

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

 Edge issue #7165383 #18543
Edge

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

 Edge issue #6274505 #18228
Edge

Hovering over descendant SVG element fires mouseleave event at ancestor

 Edge issue #7787318 #19670
Edge

Active position: fixed; <button> flickers when scrolling

 Edge issue #8770398 #20507
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

Layout with floated columns breaks when printing

 Mozilla bug #1315994 #21092
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

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

 Chromium issue #749848 #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

position: absolute element that’s wider than its column is incorrectly clipped to column boundary

 Chromium issue #269061 #20161
Chrome (Windows & Linux)

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

 Chromium issue #449180 #15298
Chrome

Significant performance hit for dynamic SVGs with text depending on the number of fonts in font-family.

 Chromium issue #781344 #24673
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

Link to container with id and tabindex results in container being ignored by VoiceOver (affects skip links)

 WebKit bug #163658 #20732
Safari

CSS min-width and max-width media features should not round fractional pixel

 WebKit bug #178261 #25166
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 (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)

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 (iOS)

Element which is position:fixed disappears after opening a <select> menu

 WebKit bug #162362 #20759
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)
Edge

Focusable elements should fire focus event / receive :focus styling when they receive Narrator/accessibility focus

 Microsoft A11y UserVoice idea #16717318 #20732
Edge

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

 Edge UserVoice idea #12299532 #19984
Edge

Implement the HTML5 <dialog> element

 Edge UserVoice idea #6508895 #20175
Edge

Fire a transitioncancel event when a CSS transition is canceled

 Edge UserVoice idea #15939898 #20618
Edge

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

 Edge UserVoice idea #15944476 #20143
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
Firefox

When virtual focus is on a button or link, fire actual focus on the element, too

 Mozilla bug #1000082 #20732
Chrome

Fire a transitioncancel event when a CSS transition is canceled

 Chromium issue #642487 Chromium issue #437860
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
Safari

Fire a transitioncancel event when a CSS transition is canceled

 WebKit bug #161535 #20618
Safari

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

 WebKit bug #64861 #19984
Safari

Implement the HTML5 <dialog> element

 WebKit bug #84635 #20175