Seriously a lot of people. It's mostly used to make webpages, so webdesigners use it a lot.
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As long as there is support for JavaScript in browsers, JavaScript can be called on any O/S, any platform and any machine
You may not have JavaScript enabled in your browser. Also Internet Explorer is an inferior browser, Firefox, Opera, etc. are all better suited for things such as JavaScript and CSS.
Not comparable. JavaScript is a programming language. Dreamweaver is an application (which you can use to create pages with javascript, html, etc.)
Use the length property of string in javascript.
It has to be done with Javascript. Though you could do something like this: