Bug of find element with empty attribute in v3.4

[hiz8]

Description

Hi.
After updating jQuery to 3.4, I encountered strange behavior on Edge and IE11.

Finding elements with empty attributes was successful in v3.3.
But, v3.4 and later will fail on Edge and IE11.

<div id="test">
    <input name="">
</div>

var $input = $("#test").find("[name='']");

console.log($input.length); // This will return 0, only on Edge and IE11 after updating to v3.4

Link to test case

https://jsbin.com/jitatiduqi/1/edit?html,css,js,output

If this is a bug, I'm glad if a fix is ​​considered.
Thanks.

[timmywil]

We should look into the behavior change, but it's not surprising as Edge and IE often fill in undefined attributes with empty string, making them difficult to differentiate.

[dmethvin]

Probably related to #3550

[mgol]

I added an update at #3550. @hirofumii can you check if your issue still exists with https://code.jquery.com/jquery-git.js instead of your current copy of jQuery?

[timmywil]

I checked this against jquery-git in IE11 on browserstack and it's still failing.

[timmywil]

Ok, I figured out the difference. It seems it's due to a recent optimization in Sizzle where we tried to avoid manipulating the DOM when it wasn't necessary. Turns out you get the right result if you add the ID of the context to the selector: https://jsbin.com/vasufuv/1/edit?html,js,console,output

[hiz8]

Thanks, @mgol.

I tested it in my environment just in case, but unfortunately the problem was not solved.
Apparently there is another cause (surely Sizzle?).

[timmywil]

@hirofumii See my comment above. It is indeed Sizzle.