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I'm getting a strange red background when I visit some pages using Safari. on Chrome the page is rendered in white normally.

I am not using any extensions and plugins.

How do I fix this bug?

Safari: Version 10.1.1 (12603.2.4) macOS: Sierra Version 10.12.5

enter image description here

Edit: I do not have the paint flashing feature turned on, I also noticed that this bug occurs on local images with a transparent background without any stylesheets (see image below).

I tried opening a local file image, and it opens normally on Chrome and Preview. However on safari, the images has a red background.

enter image description here

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    Which macOS version and Safari version are you using?
    – user61744
    May 30, 2017 at 8:55
  • @pjctech Safari: Version 10.1.1 (12603.2.4) macOS: Sierra Version 10.12.5
    – user2203852
    May 30, 2017 at 11:33
  • Ad blocker plus and ghostery are shown in the screen shot. Can you confirm you get red content when you make a new user account in macOS and use straight safari?
    – bmike ♦
    May 30, 2017 at 11:52
  • @bmike yes, I turned off AdBlocker and ghostly (and all the other extensions). same issue. I have updated the screenshot with the extensions removed.
    – user2203852
    May 30, 2017 at 12:42
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    Although you've turned off all extensions it'd still be good to test if you get this problem in a fresh user account (as suggested by @bmike ). To do this, go to System Preferences > Users & Groups and add another user. Then log into their account and test Safari.
    – Monomeeth ♦
    May 30, 2017 at 13:39

2 Answers 2

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I think this is a feature for web developers called "paint flashing".

Right-click on a blank bit of a page and select "Inspect Element", this will open the Web Inspector in Safari.

In the top-right corner of the Web Inspector there are a few icons. One looks like a paint brush. On your machine I bet it is selected.

Click it to turn it off.

Screenshot of Safari Web Inspector showing Paint Flashing button

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I'm encountering this bug in Catalina (10.15.2) in Safari (13.0.4) and Mail on my Macbook Pro (15" 2017). I've posted screenshots here: https://discussions.apple.com/thread/250979814?page=1

It definitely seems related to rendering, and can be partly improved by selecting things on the page/ in the email, but will often only be removed where the selection is present. I also see this red fill prior to the contents of a page rendering in a Safari window. I also see it in open email windows that were fine previously, but have to be re-rendered at some point.

I'm hesitant to reset Safari since that seems to not fix the issue. This problem seems relatively rare online, and I don't have paint flashing activated. Any other tips or ideas are welcome!

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