HTML was introduced to the public in 1990. There were no rules that prohibited commercial use.
late 1991
around 1990-1991.
john
The World Wide Web Consortium is now responsible for HTML and its different versions.
You can't use PHP in an HTML document, but you can use HTML in PHP script.
http://www.w3schools.com/HTML/
The html converters that are free to use are HTML Converter and Free HTML Converter. These two websites do a great job at converting html files to whatever you need.
There are many sites which teach you HTML,Google ithttp://www.w3schools.com/HTML/
You can't use HTML on Facebook.
Use an html snippet
You can use some basic HTML in the body of an answer. For example, you can use B for bold and the UL/LI tags for lists. To add a link, you'll need to use the Related Links sections. (Please do not link to anything commercial unless it is directly related to answering a question.) See the related link below for more information about formatting answers.
You can use some HTML for pictures and formatting, but not all HTML can be used (for security purposes). Note that you might need to play around a bit to get HTML to work.