DOCTYPE - jellyfish-tom/TIL GitHub Wiki

[SOURCES]

• https://www.w3schools.com/tags/tag_doctype.asp

The <!DOCTYPE> declaration is not an HTML tag; it is an instruction to the web browser about what version of HTML the page is written in.

The <!DOCTYPE> declaration must be the very first thing in your HTML document, before the tag.

In HTML5 there is only one type of 'DOCTYPE', in previous HTML versions there were more.