Описание тега valums-file-uploader
Valum's File Uploader is a Javascript + AJAX library for uploading multiple files with a progress-bar in FF3.6+, Safari4+, Chrome and falls back to hidden-iframe-based upload in other browsers (namely IE).
This tag refers to the original version of File Uploader, which is still available at ( https://github.com/Valums-File-Uploader/file-uploader).
There is a newer version of the library called Fine Uploader ( http://fineuploader.com/). For the newer version of the library, use fine-uploader.