`background-blend-mode` - iOS Safari: Ignored with repeating background (also depends on background size)

What type of issue is this?

Incorrect support data (example: Chrome says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

background-blend-mode is not applied by iOS/iPad OS Safari when the background also repeats (additionally depending on background-size values).

When background-blend-mode is used together with a background-color, iOS/iPad OS Safari will not blend the background image when the background is also repeated. This bug does not solely depend on just the background repeat, as it may or may not work sometimes depending on what is used as background-size: When background-size is smaller than 79% of its size, background-blend-mode is also applied in a repeating background.

CodePen: https://codepen.io/strarsis/pen/poQWPOX

What browsers does this problem apply to, if applicable?

Safari

What did you expect to see?

background-blend-mode correctly applied iOS/iPad OS Safari, as in the other browsers.

Did you test this? If so, how?

I encountered the issue while testing on an iPad device. Then I created a test case to isolate the cause of the problem in iOS/iPad OS Safari.

CodePen: https://codepen.io/strarsis/pen/poQWPOX

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://stackoverflow.com/questions/35452263/css-a-background-blend-mode-fallback-for-iphone-safari

Do you have anything more you want to share?

No response

MDN URL

No response

MDN metadata

No response

Start by reviewing the CodePen reproduction and locating the browser-compatibility data entry for background-blend-mode. Verify the reported iOS/iPadOS Safari behavior against the existing support data, including repeating backgrounds and background-size; done means the compatibility information accurately reflects the tested behavior.