"Los tres amigos" - HTML5
We call them "Los Tres Amigos".
The builder, Artist & wizard
A small note
1 - They make up what is called "Front-end Web Development". Front-end Development is what you see when you land on a page, as opposed to Back-end Development, which is actually what makes an application on the web work.
2 - Web browser like Firefox and Chrome translate these three languages into the visual webpage. Without a browser these languages are just words on a page. Sometimes, because of this, the website look is slightly different on Chrome, Firefox and definitely on Internet Explorer. Because all of these Browsers translate the code just a little differently.