[Treborika]

For instance if you copy and paste the code for XHTML into HTML5 DOCTYPE, you can expect thousands of errors.
This can interfere with cross - browser and cross-platform compatibility

[oldbuddy]

For instance if you copy and paste the code for XHTML into HTML5 DOCTYPE, you can expect thousands of errors.
This can interfere with cross - browser and cross-platform compatibility

All three are markup languages with just some features present in each which aren’t present in the others. Beginners at web design should learn HTML5 first because of it’s enhanced compatibility and widespread usage.

[Mika]

I did not create my website from scratch, I used a content management system to create my website. Unless I am specifically hired to develop a website from scratch, I don't code website

[Netherrealmer]

I purchased all of my websites. Starting from scratch have too much work and have no active members.

[oldbuddy]

The term Website in this post is EXTREMELY broad and makes the question nearly impossible answer.