Create tests for the style element

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Add some cases to test the link and base elements

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Add some cases for the bdo and time elements

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>