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A screenshot of the alt text modal in Mastodon's web app, with a preview of the image (in this case, our elephant mascot), a text field underneath it, a character counter, a button to automatically detect text on the image, and a help button that opens a popover with the headline "What is alt text?" The text that follows reads: "Alt text provides image descriptions for people with vision impairments, low-bandwidth connections, or those seeking extra context. You can improve accessibility and understanding for everyone by writing clear, concise, and objective alt text. - Capture important elements - Summarize text in images - Use regular sentence structure - Avoid redundant information - Focus on trends and key findings in complex visuals (like diagrams or maps)"