Intent to unship: explicit <angle> values in image-orientation

[Cameron McCormack]

https://drafts.csswg.org/css-images-3/#the-image-orientation

The CSS image-orientation property allows an author to control whether an image (in an <img> or generated content) is automatically rotated and flipped according to the EXIF data in the image. Originally, the specification only allowed explicit multiple-of-90° <angle> values (and a flip keyword). When we implemented image-orientation, we supported explicit angle values as well as a keyword to take the orientation from the image itself.

The specification now deprecates the explicit angle values. Since Firefox is the only browser to implement this property, I am planning to remove support for the angle values, and file an issue on the spec to remove them entirely.

https://bugzilla.mozilla.org/show_bug.cgi?id=1473450

[L. David Baron]

This sounds good to me. The remaining piece of the property is just
a toggle that lets developers opt in to honoring the EXIF
orientation in the image, which is useful for sites that want to use
photos without a lot of preprocessing.

-David

--
𝄞 L. David Baron http://dbaron.org/ 𝄂
𝄢 Mozilla https://www.mozilla.org/ 𝄂
Before I built a wall I'd ask to know
What I was walling in or walling out,
And to whom I was like to give offense.
- Robert Frost, Mending Wall (1914)