Several characters in the alt text result in no alt text at all

[OddDev]

Describe the bug

Having certain characters in the alt text (as far as I tested, these are :, ", ') makes the alt-text on images not render. I suppose it's a parsing error returning undefined or an empty string.

Steps to reproduce (if necessary)

Steps to reproduce the behavior:

1. Mak a new post
2. Add an image [My alt text. That's very "funny".](/path/to/image)
3. Open the rendered post
4. The alt text ist missing
5. Add another image [My alt text. That is very funny.](/path/to/image)
6. The alt text is there

Expected behavior

The alt text should render regardless of the given input as long as it is compliant with W3 standards.
https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-alt

Application configuration

• Single mode
• Database? [write.as]
• Open registration? [yes]
• Federation enabled? [yes]

Version or last commit:

[Naln1]

I am also experiencing this behavior. It is very frustrating as someone who cares a lot about accessibility, because it makes writing accurate and concise alt-text very difficult.

[thebaer]

Thanks for reporting this.

I've looked into it, and narrowed the issue down to our HTML sanitization policy, which isn't currently allowing HTML entities inside the alt attribute of our rendered HTML. It's a one-line fix -- I'll try to submit that soon.