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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? – LH16 May 30 '17 at 8:55
  • @pjctech Safari: Version 10.1.1 (12603.2.4) macOS: Sierra Version 10.12.5 – user2203852 May 30 '17 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 '17 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 '17 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 '17 at 13:39
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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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