TYPO3 Core

Branches: trunk

Problem:
typo3/template.php is responsible for most of the BE Template building.
Internet Explorer < 7 needs the XML prologue behind the Doctype declaration, or the XHTML handling will be done in quirks mode instead of strict compliance mode.

There is no check on the browser and its version and the XML prologue is always put behind the Doctype declaration, which makes most of the backend not valid XHTML.

Solution:
Add a browser/version check where to put the XML prologue and put it accordingly.

(issue imported from #M10950)