I've been looking into the details behind these two different categories:

1. Web runtime environments
2. Web application programming languages

I believe I have the correct information and have phrased it correctly but I am unsure. I have been searching for a while but only find snippets of information or what I can see as useless information (I could be wrong).

Here are my descriptions so far:

Web runtime environments -

A Run-time environment implements part of the core behaviour of any computer language and allows it to be modified via an API or embedded domain-specific language. A web runtime environment is similar except it uses web based languages such as Java-script which utilises the core behaviour a computer language. Another example of a Run-time environment web language is JsLibs which is a standable JavaScript development runtime environment for using JavaScript as a general all round scripting language. JavaScript is often used to create responsive interfaces which improve the user experience and provide dynamic functionality without having to wait for the server to react and direct to another page.

Web application programming languages -

A web application program language is something that mimics a traditional desktop application within a web page. For example, using PHP you can create forms and tables which use a database similar to that of Microsoft Excel.

Some of the other languages for web application programming are:

• Ajax
• Perl
• Ruby

Here are some of the resources used:
http://en.wikipedia.org/wiki/Web_application_development
http://code.google.com/p/jslibs/

I would like some confirmation that the descriptions I have created are correct as I am still slightly unsure as to whether I have hit the nail on the head.