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The SLO feature requires a fair bit of mature Javascript support, but any browser that supports HTML5 LocalStorage should work (this use of LocalStorage is independent of the choice of storage service, and it applies even when server-side storage is used). While the SLO implementation is based on modern Web standards, browser features vary so greatly that it's hard to identify minimum browser requirements.
Troubleshooting
Since Logout propagation feature - as far as the front-channel support is concerned - uses Javascript, all communication with the SPs can be traced in the Web browser. To this end, both the SAML tracer (Firefox Plugin) and the Javascript console in most browsers' developer tools can be helpful in troubleshooting. Common errors can be:
The SP’s web Server hat set the X-Frame-Options to “sameorigin”, which will make the SLO response from SP to IdP fail.
SAML Logout
SAML Logout is a more complex protocol than the simple variant described above, but the implementation is shared across the two approaches. There are really two "halves" to this:
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