An HTML Application (HTA) is a Microsoft Windows application written with HTML and Dynamic HTML. The ability to write HTAs was introduced with Microsoft Internet Explorer 5.0.
HTAs can be made from regular HTML files by simply changing the file extension to .hta. To customize the appearance of an HTA, a new tag, with attributes, was introduced: <hta:application ...>. This tag appears in the <head>...</head> section of an HTA document.
A regular HTML file is confined to the security model of the web browser i.e. to communicate with the server, manipulate the page's object model (usually to validate forms and/or create interesting visual effects) and reading/writing cookies. An HTA runs as a fully trusted application and therefore has more privileges than a normal HTML file — for example an HTA can create/edit/remove files and registry entries.
Because an HTA has more privileges than an HTML page, it cannot be executed via HTTP. Rather, the HTA must be downloaded (just like an EXE file) and executed from the local file system.
External links
- Introduction to HTML Applications (HTAs) at MSDN
- HTML Component (HTC) Reference at MSDN. An HTC encapsulates specific functionality or behavior within HTAs.
- An editor dedicated to HTAs (includes a built-in debugger)
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