Windows 10 IE 11 Window Losing Focus When Using Onblur Alert Function

Won’t fix Issue #10320609


Matt N.
Dec 27, 2016
This issue is public.
Found in
  • Internet Explorer
Reported by 1 person

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Steps to reproduce


I found an issue in IE 11 when calling an alert message with onblur. I have recreated the issue inside a very basic mini application. Please find the application code here:

<!DOCTYPE html>

<form action="demo_form.asp">
First name: <input type="text" name="FirstName" onblur="myFunction()" value="Mickey"><br>
Last name: <input type="text" name="LastName" value="Mouse"><br>

function myFunction() {
window.alert(“I am an alert box!”);


Steps to reproduce:

  1. Open the mini application in IE 11:

Version: 11.447.14393.0

Update Versions: 11.0.37 (KB3197655)

  1. Open an additional window (does not need to be IE, it can be any application)

  2. Click back on the mini application without minimizing the additional window

  3. Click anywhere within the First name field

  4. Use the mouse to click out of the First name field

  5. You will see the alert message appear on top of the additional window instead of the mini application. This is the issue.

The issue does not recreate itself when using Tab to move outside of the field, only with the mouse click.

Please research and respond with any information or root cause.



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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “Ibrahim O.”

      Changed Status to “Won’t fix”

    • Hello,
      Thank you for providing your feedback on IE.
      We are not accepting feedback on Internet Explorer through this portal any longer (unless security related). We welcome any feedback you have on Microsoft Edge using this website. This item will be closed as Won’t fix, in the meantime, you can visit and open a support incident and work with our support team to address this IE issue.
      All the best,
      The MS Edge Team 

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