Can you please explain in detail what security problem you believe you've identified here? 

HTML and CSS can style input controls in myriad ways, including those that render them effectively invisible. That does not itself represent a security vulnerability.

The codepen link says "This debug view expired.". Could you please attach a proof of concept to this bug? Thanks.

If a developer uses safari and tests Chrome on linux... it could be the case that users end up pasting confidential info and submitting it to someone unintentionally.

The source of the issue is probably the same as the textarea issue
https://bugs.chromium.org/p/chromium/issues/detail?id=727076

I've attached a local file that still has the problem

Deleted: CodePen - Form Layout #1_ CSS Grid.htm 1.3 KB

CodePen - Form Layout #1_ CSS Grid.htm 1.3 KB View Download

Thank you for providing more feedback. Adding requester "elawrence@chromium.org" to the cc list and removing "Needs-Feedback" label.

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This doesn't sound like a security issue; there's nothing that would lead a user to "paste confidential information" into this page, and upon any sort of paste, the page has full access to the clipboard's text, whether it's visible or not.

I'm not able to reproduce any functional problems here either (but it sounds like you're saying that maybe this only has a problem on one platform)? Can you explain what exactly the functional problem is?

Ah, yes, this is the same as  Issue 727076