Today there are many services and personal web pages that require password protection and that we must have controlled to access them, however many times we do not remember all of them and we resort to third-party programs to store them.
However Safari in addition to other browsers have a password management integrated into the browser with what has become an almost essential add-on to be able to keep all of them safe.
Normally when including a new password in any online service through Safari, this will pop up with a pop-up to notify us if we want to save this password for that site, even so there are some websites that are specially designed so that the browser in question does not have the ability to store the passwords.
This is so due to the type of credentials and the level of security of the same, that is, sites like private banking or confidential information medical records can be included in this exception in the password request by the browser. On the other hand, there are also less problematic online services that continue to prevent Safari from saving the password
When it comes across one of these sites, Safari may show a small message at the password entry point stating that the site has requested Safari not to save your password, however in the browser preferences we can mark within the passwords tab, the "Allow Autofill even on websites that don't save passwords" box.
With this we will achieve that even if the site in question requests not to save the password we can choose to do it.
More information -Use the 'Summarize Text' feature in OS X