Able to reproduce the issue on Win-10 using latest canary #62.0.3165.0.
Issue is not seen in OS-Mac

Using per revision bisect providing bisect results below.

Bisect Information:
--------------------
You are probably looking for a change made after 488563 (known good), but no later than 488564 (first known bad).

Change Log URL: 
-----------------
https://chromium.googlesource.com/chromium/src/+log/41b2241e9840a5d98f1f6c48f0dd899c59722e88..80f42ed65b2efec437ac51c31ebcc782dae85328

dschuyler@ - Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Thanks!!

Not sure if the abev bisection is correct. I am suspecting that https://chromium-review.googlesource.com/c/566826/ is the culprit, which change the height of the underline.

I checked on #5 and that lines up. Removing the 
height: 0;
in that CL fixes this issue.

Trivia: I also found that setting the height can also fix the issue.

I also looked into keeping the height: 0; and found that this seems to be workable, but it's a hack, so I'm not keen on it:
https://chromium-review.googlesource.com/c/584093/

Thanks for investigating Dave. I agree that 584093 is a bit hacky. Probably cleaner to partially revert the original CL 566826.

 Issue 748397  has been merged into this issue.

I created a CL to remove 'height: 0' again http://crrev.com/c/584667. 

My initial CL is in M61, should I merge the fix after it is submitted?

Yes, let's request a merge since this would affect all md-select instances, not just the one in CBD.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/45ba68f36c1ac34f7a5a584bde8621394c2618ae

commit 45ba68f36c1ac34f7a5a584bde8621394c2618ae
Author: Christian Dullweber <dullweber@chromium.org>
Date: Tue Jul 25 21:42:35 2017

Remove 'height: 0' from md-select-underline

Setting 'height: 0' in http://crrev.com/c/566826 caused issues when 
zooming out. This CL removes the height attribute and increases the 
margin in Clear Browsing Data to keep the dropdown and the label on 
the same height.

Screenshot 100%
https://screenshot.googleplex.com/jJAZs5TFgiD.png

Screenshot 90%
https://screenshot.googleplex.com/ZrDWbud2VVs.png

Bug:  747842 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ic3d08a1e0b3a28e25ddde70a35a373bf089cb277
Reviewed-on: https://chromium-review.googlesource.com/584667
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489447}
[modify] https://crrev.com/45ba68f36c1ac34f7a5a584bde8621394c2618ae/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html
[modify] https://crrev.com/45ba68f36c1ac34f7a5a584bde8621394c2618ae/ui/webui/resources/html/md_select_css.html

I would like to request a merge to M61 for a css fix that partially reverts a change introduced in M61.

Your change meets the bar and is auto-approved for M61. Please go ahead and merge the CL to branch 3163 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), ketakid @(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8f22d13b53812146dbbafac9d3afc2e918f5d736

commit 8f22d13b53812146dbbafac9d3afc2e918f5d736
Author: Christian Dullweber <dullweber@chromium.org>
Date: Thu Jul 27 10:52:07 2017

Remove 'height: 0' from md-select-underline

Setting 'height: 0' in http://crrev.com/c/566826 caused issues when
zooming out. This CL removes the height attribute and increases the
margin in Clear Browsing Data to keep the dropdown and the label on
the same height.

Screenshot 100%
https://screenshot.googleplex.com/jJAZs5TFgiD.png

Screenshot 90%
https://screenshot.googleplex.com/ZrDWbud2VVs.png

TBR=dullweber@chromium.org

(cherry picked from commit 45ba68f36c1ac34f7a5a584bde8621394c2618ae)

Bug:  747842 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ic3d08a1e0b3a28e25ddde70a35a373bf089cb277
Reviewed-on: https://chromium-review.googlesource.com/584667
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#489447}
Reviewed-on: https://chromium-review.googlesource.com/588909
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/branch-heads/3163@{#75}
Cr-Branched-From: ff259bab28b35d242e10186cd63af7ed404fae0d-refs/heads/master@{#488528}
[modify] https://crrev.com/8f22d13b53812146dbbafac9d3afc2e918f5d736/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html
[modify] https://crrev.com/8f22d13b53812146dbbafac9d3afc2e918f5d736/ui/webui/resources/html/md_select_css.html

Verified the issue on latest 61  i.e;61.0.3163.25 dev and is fixed. So, adding verified labels.

Thanks!!

Note: Above issue is fixed on latest Dev version:61.0.3163.25 (Official Build) on Windows,Linux

Please find the attachment.

Deleted: Actual_90.png 69.9 KB

	Actual_90.png 69.9 KB View Download