It happens again and again that inexperienced users want to upload unnecessarily large files to the server.
With this little onchange oneLiner you can check that before uploading.
Use data-mfs=.... (....=fileSize)
<!DOCTYPE html>
<html lang=de>
<head>
<meta charset=UTF-8>
<title>Document</title>
<h1>check max filesize</h1>
<form>
<input type=file
name=filename
data-mfs=100000 onchange="this.setCustomValidity(this.files[0].size>this.dataset.mfs?'to big!!':'')"
required>
<input type=submit>
</form>
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