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Answer(s) to How to upload an image to a post? (found in metaFAQ) explain several reasons why we should

replace the default "enter image description here" with something meaningful.

Are there any particular characters or sequences that should never be put in an image description? Things that might break the page or result in undesirable or unexpected behavior?

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result in undesirable or unexpected behavior?

Consider the idea is screenreaders should be able to read it, and it should describe the image. You're probably better off not using many of these

Emoji 🤔
𝖀𝖓𝖎𝖈𝖔𝖉𝖊 𝖋𝖔𝖗 𝖘𝖎𝖒𝖚𝖑𝖆𝖙𝖎𝖓𝖌 𝖋𝖆𝖓𝖈𝖞 𝖋𝖔𝖓𝖙𝖘

ssǝuıןןıs ɹǝɥʇo ɹO

Of course Zalgo text, a thing so horrible I'm hiding it under a spoiler tag so it doesn't break weaker minds, or at least hide the rest of the abominations I've trotted out

L̷̹̈͗́̎̒̉̽ë̷̢̤͕̙̬͕͎̘̳̹̳́̈́͊̌̂́̕̚̕ͅţ̷̧̢̛͇͉͖͎̥͔̫̞̠͉̗͋̃̑̍s̵̳̹̪͓͈̹̟̏͗͛̓͘ ̵̟̮͍̼̜̦̝̩̎̂̄ņ̶̝̖̣̮͍̱̫͍͑̉ǒ̵̞͖̏̚ṭ̶̨͕̄̍͊͌̈͐̋̈́̕ ̸̖̯͉̠͎̜̙͉͙̤͕̮̭͇̣̈́̔̽̽f̷̨͚̙̯̱̮͓̙̩͍͚̺͑̈́̿̉͆͜ợ̸̢̢̢̛͙̗͙͍̹̝̖̳̬̗̒̔́̌̎̈́́͐̆́͘̚͜r̵̨̘̳̺̖̝̥̮͇̙̯̜̊̅̋͐̚͜͝ͅg̵̹̦̰̗̫͌͑̏̊̾̎̓̆͆̑̏̈̚͠͠͝ȩ̷̛̖̹̖̬̳̹̺̮͈̜̩̯̹̈͂̃͌̍̊̊̽́͂̾̿̈́̚͝͠ͅt̷̛͉̺̺̜̙͇͋͆͂̌̈̑̌̂̄͂͝ ̴̭̏̋̉̂̂̀͊̈́̎̀̿͂͐͒̾̚͝t̸̨̨͖̹̰͇̭̖̜͕͖̘̘͍̭͇͔̍̏̀̂̚h̸̨̞̫̼̯͈̙̪͇̟͍̼̩̘͋͗́̉̋̅̄̒͑͗̇̋͘͠ͅͅę̷̡̪̼͔͔̪̥̜͕̫̙̝̮̼̺̀̓͊̄̋͝ ̶̡̡̭͇͉͔̝͍̻͇̩͈̬̼͛͊͛̒͊̋͂̌̈́̅͋̉̄͐͐̇͜͝ͅh̸̡̡̛̛̙̖̳̜̹̼̙̲̽͊ō̶̠̐̊́̏͗̅̿́r̶̨̳̩͕͗r̷̰̎͗̐̏̑̑̈́̂̔͘ơ̶̡̨̛̬͍̟̻̖͕͚̦̭͖̜̲̍̏̂̊̒̊́́̆̊̅̄́̏̚ṙ̶̢̩̥̝̟̪͓͈̱̥͂ͅş̸̰̟̟͇͇͗̓̋̍͋ ̷̣̗̯̝̘̘̼̐̅̉͛̂͑̕͜o̴̡̨̗̺̺̣͇͔̼̰̮̫̐̈́̓̋̽̎́f̸̨͎̬̲̹̝͓͔̮̪͎̭̿́̐̆̍͆̕ ̴̛̺͚̗̭̼̳̦̘͍͈̘̗̫̠͔̞̀͆͋̓̉͌͒͘̚͝͠ş̸̭̻̰͈͇̮̳͈͓͕̙̅̉̓̋̓̂̀̆͘͘͝ẗ̸̛͎̣̼̻͖͙͓̥͔̤͕̖͖̿̀͆͐̋̍͌͜a̵͇̍̀c̵̰͎̪̼͚͇̲͍̞͖͛̈́́̌̀͆k̷̡̢̛͔̤̯͇̫͎̤̦̞̙̦̦̙̰ͅȅ̸̝̝̪͙͓̗͈̼̟̟͖̺̎̀̈d̴͙͐̀̒̉̅͗̔͂̾͑͐̀̋̆̕̕ ̴͕̠̟͉̩̥̦̭͔̓́̄̿͗͋̎͌̄͋͗̾̀d̷̛̲̘͔̰̖̼͙̺̳͌̌i̸̡͍͉̯͗̔a̴̭̯̲̬̿̿̂̊͒̌̈̑͠c̶̡̢̥̳͉̘̻̋r̵̘͕̻̮̤̱͑̊̏̎̒͊̌͒̀̉͝i̶̛̯͙̹̊͛̒̂͆͛̽̇̋͂̈́̿͋́̒̒t̶̢̖͇͕̗͇̼̤̩͈͓̗̣͋̋̐́̈́̎̽̎́̕̚͜͝į̶̨̧̺͔̼̻̠͉̤͋͌́͒͌̓̐̏̋͊̚͝͝ć̶̡̪͖̥̪̺̄̄̿̆́̃́̾́̕̕s̸̠̩̤̹̝̬̭͕̟̪̥̈́̀̆͘

Basically if its not plain text in the language of your reader its probably a bad idea.

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  • That looks surprisingly like Vulcan so I guess no Vulcan? ;-) – uhoh Feb 16 '20 at 9:20
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    Unless we manage to last till the Federation :D – Journeyman Geek Feb 16 '20 at 9:25
  • google prompted me to translate, with curious results i.stack.imgur.com/Favoh.gif – uhoh Feb 16 '20 at 10:43
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    @uhoh Animated GIFs - another abomination :) – DavidPostill Feb 16 '20 at 11:07
  • Once or twice I've included a url within an image description, is there any chance that would be bad (assuming the url itself wasn't)? – uhoh Apr 30 '20 at 9:00
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    Do you understand the irony of using inaccessible spoiler markup in an answer about accessibility? – Tsundoku Dec 16 '20 at 13:46
  • I'm still kinda curious about URLs appearing in the description. It's kinda convenient, but I always wonder if it could send somebody somewhere without them wanting to be sent somehow. – uhoh Dec 16 '20 at 14:54
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    I wouldn't generally see it as bad but somewhat pointless unless the link bad value for someone who needed alt text @uhoh – Journeyman Geek Dec 16 '20 at 15:53
  • @Tsundoku mildly but I was trying to give examples. I guess I could have done a screenshot, with unacceptable alt text instead. – Journeyman Geek Dec 17 '20 at 0:00

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