Created attachment 366497 [details] Screen recording of the bug on the Twitter timeline This issue affects specially the Twitter timeline page. Sometimes, when scrolling the page, a tweet block background color changes to black. Hovering the element may change it back to normal. 1) Open a Twitter timeline page. (Used my own timeline, https://twitter.com/@blude) 2) Scroll down the page. (Keep the mouse pointer away from the main timeline region) The tweet content blocks have a `:hover` selector used to change its background color to light-gray. Some rare blocks, anecdotally ones with rich media displayed, will have its background color changed or flashed to black when scrolling. The tweet blocks should retain its normal background color. Hovering the mouse pointer into the affected block will revert the background color to its correct style. This issued was not noticed in macOS Safari version prior to 12.1 The attached video file has a screen recording of the issue.
Created attachment 366498 [details] Screen recording of the bug on the Twitter timeline
What hardware do you see this one (including graphics/screen configuration)?
Hardware is a MacBook Pro (Retina, 15-inch, Mid 2015)
Hardware is a MacBook Pro (Retina, 15-inch, Mid 2015) General ======= Model Name: MacBook Pro Model Identifier: MacBookPro11,4 Processor Name: Intel Core i7 Processor Speed: 2,2 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 6 MB Memory: 16 GB Boot ROM Version: 189.0.0.0.0 SMC Version (system): 2.29f24 Graphics ======== Intel Iris Pro: Chipset Model: Intel Iris Pro Type: GPU Bus: Built-In VRAM (Dynamic, Max): 1536 MB Vendor: Intel Device ID: 0x0d26 Revision ID: 0x0008 Metal: Supported, feature set macOS GPUFamily1 v4 Displays: Color LCD: Display Type: Built-In Retina LCD Resolution: 2880 x 1800 Retina Framebuffer Depth: 24-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Rotation: Supported Automatically Adjust Brightness: No
Created attachment 366574 [details] System Profile full Full system profile generated by system report
<rdar://problem/49565685>