Most mobile browsers show alt text when you long press the image, sometimes you have to tap on the alt text if it’s longer than a few words (same as mentioned by the Firefox comment)
Also, in sync for lemmy the xkcd comics load as an image but the overflow menu contains extra details including alt text.
How do you view the alttext on mobile?
XKCD has a mobile website, just change the URL to m.xkcd.com and it shows the alt text at the bottom
Here’s a mobile link for the comic.
Looks like I’m one of today’s lucky 10,000
On Firefox, long press the image. If the alt text is long then you also have to press the text to expand it.
Most mobile browsers show alt text when you long press the image, sometimes you have to tap on the alt text if it’s longer than a few words (same as mentioned by the Firefox comment)
Also, in sync for lemmy the xkcd comics load as an image but the overflow menu contains extra details including alt text.