Determine the type and size of files prior to uploading

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How can jQuery limit file types for upload?

I have an inquiry. I am planning to use Ajax to submit a form that may include file uploads. Can you advise me on how to determine the selected file type and size before uploading? I understand that this can be achieved using the FILE API in HTML5, but it is not supported in Internet Explorer versions 7, 8, and 9. Do you have any insights on how I can achieve this without using plugins, by creating a customized solution instead?

I prefer to avoid utilizing third-party plugins and aim to develop a personalized approach.

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