generalize url usage in tests

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8713 5f5364db-9458-4db8-a492-e30667be6df6
more HTMLElement hacking

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8714 5f5364db-9458-4db8-a492-e30667be6df6
html error fix

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8715 5f5364db-9458-4db8-a492-e30667be6df6
HTMLElement.insertAdjacentHTML() is available in FF since version 8

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8716 5f5364db-9458-4db8-a492-e30667be6df6