Forum Moderators: mack
If you have problems you should receive a suggestion from the validator.
Transitional is a lot more flexible than strict, so you will get away with a little bit more.
Mack.
Most versions of (x)html have transitional and strict versions of their code and thus strict is harder to validate your code.
You can use many validators to ensure you are properly creating code, an example is the W3C's validator which can be found here...
[validator.w3.org...]
After HTML is XHTML which is not that different though HTML 4.01 transitional should serve most people just fine.