Is HTML5 and CSS3 supported by HTA? If I am planning to use my application only with Windows operating system: It is a simple application that does some basic file handling, is HTA a viable option?
Will there be any serious performance issues if I use a simple flat file (text file) to store data of my HTA?
To make this clear: HTA will probably not work in anything that's not IE.
Late post but after testing, yes, HTA are fully support by Windows 10 and IE/Edge Browser.
You can run HTML applications in Windows by double-clicking HTA files. After you double-click an HTA file, Windows opens the application in Internet Explorer and runs the embedded code.
To summarize, you have to include such kind of meta line in your HTA to make it support CSS3:
<meta http-equiv="x-ua-compatible" content="ie=9">
HTAs not only support everything a webpage does—namely HTML, Cascading Style Sheets (CSS), scripting languages, and behaviors—but also HTA–specific functionality. This added functionality provides control over user interface design and access to the client system.
http://msdn.microsoft.com/en-us/library/ms536496(v=vs.85).aspx
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