Exif orientation test incorrectly returns false in iOS Safari version 13.3 and below

[OliverJAsh]

Type of bug

• Differences between Can I use & Modernizr
• False positive
• False negative
• Modernizr error

Describe the bug

The Exif orientation test returns false in iOS Safari 13.3 and below.

How to Reproduce
https://stackblitz.com/edit/js-rq1mxv?file=index.html
or
https://stackblitz.com/edit/feature-detect-img-orientation-uyxm7k?file=index.ts

Expected behavior
It should return true.

Additional context
iOS Safari only honours Exif orientation if the element has been added to the DOM and it is visible. Here is a test that works: https://stackblitz.com/edit/feature-detect-img-orientation?file=index.ts

[Markel]

Sorry for the late response @OliverJAsh

🤔💭 So this is kind of a partial support, how do you think we should approach this @rejas ?

(Background for whoever needs it: Modernizr only has two states: supported or not supported, parcial support is not contemplated)

[rejas]

Ah, partial support... That already came up in #2476
But other than asking caniuse how they define partial support, not much has happened in that direction: Fyrd/caniuse#5119
Not sure how we can map that to our data...

[richex-cn]

I'm also meet this problem in iPhone OS 12.0, and no solution has been found yet, So I used a temporary solution, just check userAgent is iPhone and version less than 13.3