JavaScript upload size limit -

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So I am trying to set the upload size limit, but it has failed. I have included the code with explanation, please take a look and if you can help me, I would be very grateful. I need help with more information "//" after the code is: `

  & lt; Html & gt; & Lt; P id = "check" & gt; & Lt; / P & gt; // OK then this part's & lt; Script & gt; User "email.html" & lt; Script type = "text / javascript" & gt; Function getFile () {document.getElementById ("file"). Click (); } Function sub (obj) {var file = obj.value; Document.myForm.submit (); } & Lt; / Script & gt;

// Here is the button to upload a file (or image in my case)

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