Bug 318201 – [Quirks] mms.pinduoduo.com shows Safari a "your browser is not Chrome" interstitial

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKit Misc.

[Karl Dubost]

The Pinduoduo merchant back-office (拼多多商家后台) at
https://mms.pinduoduo.com/ redirects to its login page

  https://mms.pinduoduo.com/login/?redirectUrl=https%3A%2F%2Fmms.pinduoduo.com%2F

and overlays a modal interstitial in Safari:

  "我们检测到您的浏览器不是chrome浏览器，可能存在安全风险，或导致页面无法
   正常显示，为了不影响您正常使用，建议您使用chrome浏览器打开网站！"
  [下载最新版Chrome] [已安装去使用]

("We detected your browser is not Chrome. there may be security risks, or the
page may not display correctly. We recommend opening the site in Chrome.")

The modal does not appear in Chrome. The login QR/account form renders behind
the modal, so the page is otherwise functional. this is purely a user-agent
gate against non-Chrome browsers.

Steps to reproduce:
  1. Open Safari.
  2. Navigate to https://mms.pinduoduo.com/
  3. Observe the redirect to the login page and the "not Chrome" modal.

Expected: the login page is usable without a "use Chrome" interstitial.
Actual:   a modal blocks the page recommending Chrome.

[Karl Dubost]

<rdar://180551491>

[Karl Dubost]

Pull request: https://github.com/WebKit/WebKit/pull/68302

[EWS]

Committed 316336@main (988c6a663e9a): <https://commits.webkit.org/316336@main>

Reviewed commits have been landed. Closing PR #68302 and removing active labels.