html5 & input & accept attribute
html input accept attribute
https://www.w3schools.com/TAGS/att_input_accept.asp
https://stackoverflow.com/questions/181214/file-input-accept-attribute-is-it-useful
https://exceptionshub.com/html-inputfile-accept-attribute-file-type-csv.html
https://stackoverflow.com/questions/1548194/how-to-get-the-htmls-input-element-of-file-type-to-only-accept-pdf-files
https://stackoverflow.com/questions/181214/file-input-accept-attribute-is-it-useful
<h1>Match all image files (image/*)</h1>
<input type="file" accept="image/*">
<h1>Match all video files (video/*)</h1>
<input type="file" accept="video/*">
<h1>Match all audio files (audio/*)</h1>
<input type="file" accept="audio/*">
<h1>Match all image files (image/*) and files with the extension ".someext"</h1>
<input type="file" accept=".someext,image/*">
<h1>Match all image files (image/*) and video files (video/*)</h1>
<input type="file" accept="image/*,video/*">
html input file accept
input & file
https://www.w3schools.com/TAGS/att_input_accept.asp
https://exceptionshub.com/html-inputfile-accept-attribute-file-type-csv.html
// application/vnd.openxmlformats-officedocument.spreadsheetml.sheet (.XLSX) & Excel Files 2007+ (.xlsx)
// application/vnd.ms-excel (.XLS) & Excel Files 97-2003 (.xls)
// CSV files (.csv)
<input id="fileSelect" type="file" accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" />
https://www.cnblogs.com/90nice/p/3343917.html
https://www.cnblogs.com/sode/archive/2012/12/27/2835346.html
Content Type
HTTP & MIME_types
https://sharepoint.stackexchange.com/questions/25434/parent-content-type
https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types
Multipurpose Internet Mail Extensions or MIME type
https://stackoverflow.com/questions/8799419/what-is-the-correct-mime-type-for-json