TYPO3 Core

I experienced similar behaviour with following difference: the compressor removes the whitespaces, which results in an invalid rule:

width: calc(100% + 16px);

width: calc(100%+16px);

But "+" and "-" must be wrapped with whitespaces: http://www.w3.org/TR/2006/WD-css3-values-20060919/#calc

I digged around in the compressor and will push a possible solution

Patch set 1 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/35366

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/35366

Patch set 2 for branch TYPO3_6-2 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/34180

This patch leads to PHP segfaults on PHP versions with older PCRE versions. It will be reverted in #64950 for 6.2 for now, and master will get a PCRE version check in install tool.

Please see the related issue for more details.

This patch could potentially be fixed again in 6.2 if a regex can be found that does not crash php ...