I’m building a small-scale website (a personal one) in which each page would have the same set of header elements (I’m not talking about the <head> element). In other words, I want each page to have essentially the same title at the top of the page and the same navigation bar below that (with possibly minor differences in each page). It’s kind of like how StackOverflow has that navigation bar (with the logo, and the Questions, Tags, etc. buttons) on the top of every page.
Is it possible create such a header for every web page without copying and pasting the HTML code to do so? I really don’t want to run into a situation where if I want to make a single change, I would have to change all of my pages containing the header.
Real web sites use real web frameworks, which have a concept called a “layout” (at least that’s what they’re called in Rails; as mentioned in Uwe’s answer, they’re called master pages in ASP.NET). All the common “templatey” stuff goes into a layout.