Blockquote footer font size is currently hardcoded to 80%, implying (in a comment) that this would result in the default font size. However, since the blockquote font size itself is variable, this is not necessarily true, and 80% of anything actually results in an arbitrary font size.

80% as a default is still fine.

This isn't needed, because it's not supposed to be seen normally, with JavaScript enabled.

Specify new height for inputs in floating label example after v4.1.3's addition of a fixed height property on .form-control

Matches the method used for the modal header. Fixes #26955.

This reverts commit 8bb35313.

This is no longer needed.

This reverts commit 9e5ec00d.

Unfortunately, we are getting too many timeouts.

It's slower, but since it runs only on Travis, we better be safe.

Also, enforce LF in clean-css.

see: https://github.com/twbs/bootstrap/issues/26847
in v4, destroy was replaced by dispose

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