Having trouble sending a form to a window.

I'm a bit stymied on what I'm doing wrong. I have the following apparently straightforward HTML code:
<form name="editForm" method="post" action="updPurchDataEdit.jsp" target="PurchEdit">
<input type="hidden" name="purchaseId" value="168">

<div style="position: absolute; top: 110px; left: 60px; font-size: smaller; font-weight: bold"

<!--  onclick="var w = window.open('','PurchEdit','width=900,height=540,top=50');

<img alt="" style="vertical-align: bottom" src="images/Write1a.gif"/> Edit Purchase

Open in new window

When I run this as shown, it works fine. When I run the commented code ("var w = ...) instead of the "location= ..." code, I get a blank page, no form inside. I've done this dozens of times and in fact have another such window.open in the same program that works fine. Can anyone see what might be wrong here? This used to work.
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Julian HansenCommented:
It works for me - of course you are removing the other

Open in new window

Before you uncommet the commented section ....?
MarkAuthor Commented:
I was able to figure this problem out with the help of the HTML validation tool at https://validator.w3.org/ and using the Linux Kate editor which highlights html tags and matches DIVs. My html is fairly large, conditionally constructed via jsp. It turned out that I had a number of misplaced </div> and </form> statements which https://validator.w3.org/ easily flagged and the Kate editor allowed me to collapse and expand blocks to see what end tags matched with what. After fixing up the HTML (no errors found by https://validator.w3.org/) the open.window() code shown in my O.P. started working just fine.

Even though I had not other comments on this I'm going to leave it stand and not delete the question since others might find these tools useful for similar purposes.

Oh! It looks like Julian Hansen submitted a comment at the same time as me!

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MarkAuthor Commented:
Julian, you win the points just because!
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