Based on chromium; this should work : (the suggest password comes after already known passwords for that site)

<form id="login" action="signup.php" method="post">
  <input type="text" autocomplete="username">
  <input type="password" autocomplete="new-password">
  <input type="password" autocomplete="new-password">
  <input type="submit" value="Sign Up!">
</form>

more examples : https://www.chromium.org/developers/design-documents/form-styles-that-chromium-understands

Answer from SvennD on Stack Overflow
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LastPass
lastpass.com › features › password-generator
Password Generator - LastPass
Create a secure password using our generator tool. Help prevent a security threat by getting a strong password today on Lastpass.com
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Google
passwords.google.com › intro
Google Password Manager
Safely save and organize your passwords, anywhere you use your Google Account
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Google Play
play.google.com › store › apps › details
Password Generator - Apps on Google Play
Password Generator is open source app for generating secure passwords using cryptographically secure pseudo-random number generator. You are given options to choose which characters your password should contain or you can choose your set of ...
Rating: 4.8 ​ - ​ 3.11K votes
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Chrome Web Store
chromewebstore.google.com › detail › kknghfgohminjbcadngbfnhjojeaoakj
Strong Password Generator - Chrome Web Store
Use Strong Password Generator: a powerful random password generator and password creator to keep your accounts secure.
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Google Support
support.google.com › chrome › answer › 7570435
Generate a password - Computer - Google Chrome Help
If this option doesn’t show, right-click the password text box Generate password.
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Chrome Web Store
chromewebstore.google.com › detail › random-password-generator › mocnjepdabllpdhmaaddmjdlmmclnmah
Random password generator - Chrome Web Store
Use Strong Password Generator: a powerful random password generator and password creator to keep your accounts secure.
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Google Support
support.google.com › chrome › answer › 7570435
Generate a password - Android - Google Chrome Help
You'll get a preview of the password. To confirm, tap Use password. Finish your account sign-up. Your generated password is automatically saved to your Google Account.
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Chrome Web Store
chromewebstore.google.com › detail › password-generator › jnjobgjobffgmgfnkpkjfjkkfhfikmfl
Password generator - Chrome Web Store
Use Strong Password Generator: a powerful random password generator and password creator to keep your accounts secure.
Find elsewhere
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Norton
us.norton.com › feature › password-generator
Norton Password Generator - Generate Strong Passwords
With the use of algorithms, password generators create strong and unique passwords based on a combination of numbers, symbols and characters. They’re designed to help you generate the most secure password possible.
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F-Secure
f-secure.com › us-en › password-generator
Random password generator | Free strong passwords | F‑Secure
Often a pass­word app is also a strong pass­word generator. You can copy your pass­words when needed, or even use auto­fill to let the app do that for you. It’s safer, faster, and easier than any other pass­word practice. A strong password can be cracked, but you can make it virtually impossible for criminals.
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Dashlane
dashlane.com › features › password-generator
Password Generator | Dashlane
6 days ago - Our password generator allows you to create strong, random passwords with one click to boost your online security.
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Google Support
support.google.com › chrome › answer › 95606
Manage passwords in Chrome - Computer - Google Chrome Help
If this option doesn’t show, right-click the password text box Generate password.
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Reddit
reddit.com › r/chrome › suggest strong password isn't showing
r/chrome on Reddit: Suggest strong password isn't showing
April 14, 2022 -

Hey. I switched from firefox to chrome a couple days ago. What I always loved about firefox is the built in pw manager. I love that it auto generated strong pws for me and automatically saved them. Apparently chrome has this feature too but yet I can't find it. I already used google to find answers but I couldn't find anything.

Yes SYNC is turned on. Yes I tried it on popular websites, it's not even working on google.com itself.

Yes I right clicked in the PW field, there is no "suggest password" field there. Only the usual like inspect, paste, spellcheck and so on. I simply don't have any pw suggestion field anywhere and it's driving me crazy. This is unironically a deal breaker for me and I will switch back to firefox if I can't solve this.

NO I don't want to use any third party app like last pass or whatever. I want it built in.

Further information: When I left click on a PW field it, instead of suggestion me a new strong pw it just shows me the name + pws of accounts that I ALREADY have created. Which makes no sense. I don't want the SAME password again. I want a new one.

I imported all of my pws from firefox to chrome. Is this what is causing this bug maybe?

In any case I hope you can help me. I really really want to use the built in PW manager.

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Chromium
chromium.org › developers › design-documents › password-generation
Password Generation
If a signal is received from Autofill when the form is rendered, we mark the password field. When the users focuses this field, we show an Autofill like dropdown with a password suggestion. The generated password is generic enough that it works on most sites as is, but not all sites have the same requirements.
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Chrome Web Store
chromewebstore.google.com › detail › generate-strong-password › nnpklgjfbellkfnifhocppdelmjjjipg
Generate Strong Password - Chrome Web Store
This extension allows users to generate strong, random passwords with a single click from their browser's context menu. When you right-click on a text field where you need to enter a password, you can select "Generate Strong Password" to create ...
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Google Account
myaccount.google.com › apppasswords
Sign in - Google Accounts
Sign in · Use your Google Account · Not your computer? Use Guest mode to sign in privately. Learn more about using Guest mode · Create account
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Google
blog.google › products › chrome › password-manager-update
Staying safe online with our updated Google Password Manager
Google Password Manager can create unique, strong passwords for you across platforms, and helps ensure your passwords aren’t compromised as you browse the web. We’re constantly working to expand these capabilities, which is why we’re giving ...
Published   August 29, 2023
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Avast
avast.com › en-us › random-password-generator
Random Password Generator | Create Strong Passwords
Generate secure passwords for your online accounts with our free random password generator. Create strong passwords, free!