Border width is not rounded correctly when page is zoomed

Issue #14444358 • Assigned to Bogdan B.


Kuba F.
Oct 30, 2017
This issue is public.
Found in
  • Microsoft Edge
  • Chrome
  • Firefox
  • Opera
Found in build #
Reported by 1 person

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Steps to reproduce

Found in build:
Microsoft Edge 40.15063.0.0
Microsoft EdgeHTML 15.15063

Steps to reproduce:

One test case available on codepen.
Basically there is one absolute positioned div with a 50px yellow border and second a div below first one with width=50px, background:black - as you can see elements doesn’t perfectly overlap each other - as they should.

Another way to reproduce this behaviour would be as follows:

  1. Create new block element.
  2. Put border 5px style on it (also breaks for every integer not divisible by 4).
  3. Look at div’s border width in inspector - it’s calculated as 4.8px (for 5px test case).

From other useful informations bug is happening on windows 10 with scaling 125% enabled in system settings screenshot.

Also, same bug was happening in chrome and was addressed in last few months (link to issue on chromium bugtracker).

For future - bug is also reported on [](Firefox bugzilla).

Actual results:

Border’s width was not rendered properly (as seen on screenshot in attachment - result.png) - can’t say what caused it.

Expected results:

Rendered border width should be the same as written in CSS, especially for values without floating point.


1 attachment

Comments and activity

  • Ah, I forgot one thing - you can observe bug only if you zoom in the page by 130% (with use of ctrl + mouse scroll).

  • Microsoft Edge Team

    Changed Assigned To to “James M.”

    Changed Assigned To to “bbrinza”

    Changed Assigned To from “bbrinza” to “Bogdan B.”

    Changed Status to “Won’t fix”

    Changed Status from “Won’t fix”

  • Reactivating auto-resolved valid bugs reported by web dev community. Those were not expected to be resolved. We apologize for any inconvenience!

  • Microsoft Edge Team

    Changed Assigned To to “Bogdan B.”

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