Today I learned

Never forget alt tags again

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To make sure you added an alt tag to all your images, you can set a specific CSS rule, which highlights the images missing an alt tag.

img:not([alt]) {
  filter: blur(5px);

Addy Osmani explains it on the Twitter Link below. Alt tags are necessary for visual impaired users, who can not see an image but the screenreader can read the alt tag to them. So if you leave it out, they have no chance to get any information from it.

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