This is the use case where the web page should not interfere, thereby enabling the user to use their password manager. You can't even log in to eBay using 1Password any more. That's ridiculous.
Perhaps what is needed is autocomplete="secure" where the browser will only autocomplete after challenging the user for a master password.
I used to solve this "security" feature by patching the Safari binary to ignore the attribute. Became too much of a hassle to chase that, but I seriously resent site developers who think they know better than I how I "should" be entering data on my machine.
Seriously - a number of the complaints on both sides of the issue in this thread point to this. Running a lab and have a problem with autocomplete remembering passwords? That's should be a site-specific setting. Have a physical issue with typing, and use assistive software? The browser should have a setting to get out of the %$&^@*% way. Run your own machine securely (by whatever standards you choose to judge that)? It shouldn't be eBay's, or Apple's, or Google's decision how you choose to type your password.
While I'm ranting, I'm seriously sick of a particular strain of arrogance mixed with refusal to take responsibility that emerges in these discussions. I recently had a discussion where a UX person confidently told me that they did, in fact, know better than I on a similar topic. OK, fine; here's a use case in which it seems that you're wrong. "Well, we can't cover every case; we have to plan for the 80% scenarios".
You know my needs better than I, but refuse to take responsibility when you're wrong? Sounds like a good time to show a bit of humility and allow the user you apparently think so little of to make a choice.
I come off the opposite end, where this browser thinks it knows the data I want to enter better than I do. It doesn't. Neither do developers. I just want to use my browser plugin and ignore them both.
For what it's worth, 1Password worked to log into eBay for me just now. Safari 9.1.1, 1Password 6.3.1.
There does seem to be a bit of an arms race with some web sites, though, where the sites manage to break 1Password (whether intentional or not, I'm not sure) and then 1Password fixes it on their end. I wouldn't be surprised if eBay was broken and then got fixed.
