After a clean install of eZPlatform, going to the homepage, will show a huge amount of warnings:

Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet.html]: xsl:import :
invalid URI reference D:\htdocs\ezp\installs\ezplatform-15.09\ezpublish/../vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/FieldType/XmlText/Input/Resources/stylesheets/eZXml2Html5_custom.xsl
in D:\htdocs\ezp\installs\ezplatform-15.09\vendor\ezsystems\ezpublish-kernel\eZ\Publish\Core\FieldType\XmlText\Converter\Html5.php on line 136

It seems that the href attribute in the xslt, generated by php code, should use forward slashes instead of the windows style slashes.