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1. href=""
   This attribute can only hold proper URL links, such as https://stackexchange.com/users/, or relative or protocol-relative URL links such as /q/3122 or //stackexchange.com/users/. They cannot hold other types of links, such as relative fragments (e.g. #3122), or protocols other than HTTP or HTTPS (e.g. javascript, ftp, or mailto). Invalid hrefs will strip the entire <a> tag.*
2. title=""

1. href=""
   This attribute can only hold proper URL links, such as https://stackexchange.com/users/, or relative or protocol-relative URL links such as /q/3122 or //stackexchange.com/users/. They cannot hold other types of links, such as relative fragments (e.g. #3122), or protocols other than HTTP, HTTPS, or FTP (e.g. javascript, mailto, or magnet). Invalid hrefs will strip the entire <a> tag.*
2. title=""

Any tags not in the above list will be stripped out of the post. Do note that the sanitizer that strips out tags will recognize any text between < and > characters as HTML, and so any such text will be stripped out of the post; to prevent this, encode those characters as < and >.

Any tags not in the above list will be stripped out of the post. Do note that the sanitizer that strips out tags may falsely recognize text between < and > characters as HTML, which may cause such text to be stripped out of the post; to prevent this, encode those characters as < and >.

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