Is it wrong to use the fieldset tag without form tag?

It’s valid HTML5. Paste the following HTML at the validator: http://validator.w3.org/check: <!DOCTYPE html> <html> <head><title>Title</title></head> <body> <fieldset> <legend>Test</legend> </fieldset> </body> </html> It’s also valid HTML4. Replace <!DOCTYPE html> with the following, and it still passes the validation: <!DOCTYPE html PUBLIC “-//W3C//DTD HTML 4.01//EN” “http://www.w3.org/TR/html4/strict.dtd”>

Why do we need a fieldset tag?

The most obvious, practical example is: <fieldset> <legend>Colour</legend> <input type=”radio” name=”colour” value=”red” id=”colour_red”> <label for=”colour_red”>Red</label> <input type=”radio” name=”colour” value=”green” id=”colour_green”> <label for=”colour_green”>Green</label> <input type=”radio” name=”colour” value=”blue” id=”colour_blue”> <label for=”colour_blue”>Blue</label> </fieldset> This allows each radio button to be labeled while also providing a label for the group as a whole. This is especially important where assistive … Read more

resizes wrong; appears to have unremovable `min-width: min-content`

Update (25 Sept 2017) The Firefox bug described below is fixed as of Firefox 53 and the link to this answer has finally been removed from Bootstrap’s documentation. Also, my sincere apologies to the Mozilla contributors who had to block removing support for -moz-document partly due to this answer. The fix In WebKit and Firefox … Read more

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