Why i still able to select all type file after Targeting pdf file via accept attribute?

Question

Here's link:
https://codepen.io/nur49/pen/xxEdVRZ

Answer 1

As W3Schools says, the accept attribute is not a validation mean. In fact, input of type file will accept any kind of file. File-type filtering is done by the FileDialog of the OS. The only purpose of the accept attribute is to inform the Browser what file-type the OS FileDialog should filter.
So, the final behavior depends on the system/platform you're in.

Answer 2

https://www.w3schools.com/tags/att_input_accept.asp

<input type="file" accept="application/pdf" />