CSS is a complementary language that helps to style HTML markup code. ... for example, in PDF documents. This language should not be confused with the similar sounding language, Java. PHP.

HTML stands for Hypertext Markup Language, ... If you don't, your entire code can be screwed up. HTML is open-source, meaning that it's free to use and build upon however you like.

The HTML text code displays the following: ... Look up the markup you need through schema.org’s site search. I will show this process with an example of a product markup. Example: Product.