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Reduce z-indexes in button-group, input-group, list-group, and pagination to the minimum necessary (#24315)

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These were using `z-index: 2` to "Place active items above their
siblings for proper border styling". However, using `z-index: 1` is
sufficient for accomplishing that goal.

In input-group, there were also three `z-index: 3` rules for the
hover/focus/active states. I reduced these to `z-index: 2` since they
just needed to be "one more than normal" (i.e. one more than what is now
`z-index: 1` after my changes).

These changes can be verified by viewing the documentation pages for
Button group, Input group, List group, and Pagination before and after
this commit and observing that the active elements are still "above"
their siblings, so their borders look correct.
This commit is contained in:
rmacklin
2017-10-20 00:01:29 -07:00
committed by XhmikosR
parent 35317a4331
commit 9e6dabbb10
5 changed files with 11 additions and 9 deletions
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docs/4.0/layout/overview.md
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@@ -172,3 +172,5 @@ $zindex-tooltip: 1070 !default;
```
Background elements—like the backdrops that allow click-dismissing—tend to reside on a lower `z-index`s, while navigation and popovers utilize higher `z-index`s to ensure they overlay surrounding content.
Additionally, the `button-group`, `input-group`, `list-group`, and `pagination` components make use of setting `z-index` to `1` or `2` in order to ensure that the borders of the _active_ element correctly appear "above" their sibling elements.