Comment on [zmg] tag: image size and alt text cannot be combined correctly
harald@hub.volse.no 5 days ago @Der Pepe (Hubzilla) ⁂ Terms can be confusing, but the two attributes have different meaning for a reason.
The alt attribute is the one being used by screen readers to provide image descriptions to blind or visually impaired people.
The title attribute however is a global attribute meant to provide additional info about whatever element it's attached to. This is typically shown as a tooltip when hovering over the element.
Most screen readers will fall back to the title if the alt attribute is not present, but it's not safe to rely on that. The attributes are distinct and has a different purpose for a reason.
The alt attribute is the one being used by screen readers to provide image descriptions to blind or visually impaired people.
The title attribute however is a global attribute meant to provide additional info about whatever element it's attached to. This is typically shown as a tooltip when hovering over the element.
Most screen readers will fall back to the title if the alt attribute is not present, but it's not safe to rely on that. The attributes are distinct and has a different purpose for a reason.
I’ve just been looking into this topic in more detail, particularly in relation to Mastodon.
When you attach an image with a caption on Mastodon, both the `alt` and `title` attributes are set to that text. This means that when the image is imported into Hubzilla, the text description is also displayed as a title pop-up.
If you add a description to an image on Hubzilla by placing it between the
[zmg][/zmg]tags (the usual method), i.e.[zmg=<IMAGE_URL>]<IMAGE_DESCRIPTION[/zmg]Hubzilla behaves in exactly the same way as Mastodon, inserting the description using both the alt attribute AND the title attribute.
When this reaches Mastodon, the image description is also flagged and displayed accordingly.
If, on Hubzilla, you insert the image description within the
[zmg=]tag, the image description is added as the alt attribute, but no pop-up appears because the title attribute is not set. On the receiving end, e.g. on Mastodon, the alt text is flagged and displayed.So, if you want an image description on Hubzilla not only to be present but also to be visible as a pop-up, the “usual method” is the better choice. If it’s really just about the image description and you don’t want a huge pop-up to appear for “epic image descriptions”, then use the option with the alt attribute within the
[zmg=]tag.