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html - How to make input type= file Should accept only .xlsx and filename contain substring - Stack Overflow
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Add allowed file extensions as 'accept' attribute for file uploads to improve UX [#3031371] | Drupal.org
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html tutorial - accept Attribute in HTML - html5 - html code - html form - In 30Sec by Microsoft Award MVP - | wikitechy
![Make <input type="file"> reject dropped file(s) that don't match "accept" attribute · Issue #4216 · whatwg/html · GitHub Make <input type="file"> reject dropped file(s) that don't match "accept" attribute · Issue #4216 · whatwg/html · GitHub](https://user-images.githubusercontent.com/495429/49168712-64396000-f338-11e8-96a5-a5d166427a6c.png)
Make <input type="file"> reject dropped file(s) that don't match "accept" attribute · Issue #4216 · whatwg/html · GitHub
![html - Input type=File "Accept" property with multiple values does not working in Chrome - Stack Overflow html - Input type=File "Accept" property with multiple values does not working in Chrome - Stack Overflow](https://i.stack.imgur.com/vDlou.png)
html - Input type=File "Accept" property with multiple values does not working in Chrome - Stack Overflow
![Make <input type="file"> reject dropped file(s) that don't match "accept" attribute · Issue #4216 · whatwg/html · GitHub Make <input type="file"> reject dropped file(s) that don't match "accept" attribute · Issue #4216 · whatwg/html · GitHub](https://user-images.githubusercontent.com/495429/49168078-0e17ed00-f337-11e8-9ae7-271e32ac91a1.png)