Hi There;
I try to design a web site. There are many pages in my web site and I linked them altogether. But there are constant buttons must be existed in different pages. I mean there are buttons namely, "Home" , "About" .. vs in different HTML pages . I do not write to codes of constant buttons in every HTML pages. How can I handle this?

Thanks in advance.

It is hard to understand what you are asking, but I will try to read between the lines. I presume that you are creating some code that generates the HTML that makes your web site, and you don't want every code module to be required to generate some standard set of HTML entities. If such is the case, then one solution would be to use a template, or small number of templates, which already contain the standard collection of HTML, and to which your code adds specific other HTML code. As I understand it, this a common strategy used by web framework packages such as Ruby-On-Rails and Django.
--- rod.

It's already been said, but:

Use a backend with some sort of templating engine.

Or a content management system like Wordpress (if appropriate). If your website isn't actually an application, then Wordpress is probably appropriate.

Use include files.

Even for simple HTML pages, if javascript is enabled, you can use include files thus.

In every calling program,
and MY_COMMON_FUNCTIONS.js contains
document.write ("Hello world<br>") ;
and so on.
to write commonly used HTML code.