I think all the front-end frameworks are pretty similar, but if you are building Office add-ins, or some other application that lives in that ecosystem, then there is value in adhering to consistent UI elements.
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Absolute centering only works when the element you are trying to center has a defined height. If you are trying to center an element with unknown height inside a container with unknown height, the table-cell is likely the front-runner, sadly.
I've been thinking about the same problem lately and have come up with an approach for my use-case that might work:
* Set expiration to a low value (~15 minutes)
* Every generated JWT also gets added to an "issuedTokens" collection for each user
During JWT validation, if the expiration has passed, an "Expired" response would be returned from the server (ex. 401 w/ "Expired" in body). When the client receives this status, it should initiate a refresh process which trades an expired token for a new one.
The refresh endpoint on the server should take an expired token and perform the following:
1. Validate token (except expiration)
2. Retrieve user ID and check if token is in its issuedTokens collection
3. Issue a new JWT
4. Remove the expired token from the collection and add the new one
Upon failure of any of these steps, an Unauthorized error should be sent to client which then requires logging in again.
To prevent a never-ending build-up of issued tokens, we can set a TTL on the tokens in the issuedTokens collection. Set the TTL value to the amount of time that a login should be active for before requiring logging in again.
This approach doesn't hit the database unless you keep trying to refresh an expired token. In which case you can make use of a cached blacklist of failed tokens. This can reside next to the application itself if treated as a cache layer.
This is definitely just a work-in-progress solution that I'm about to test out. Let me know your thoughts on it.
At some point, searching for terms like "best hdtv 2013" would return a page full of sites with perfect urls like http://www.best-hdtv-2013.com/, and all of them would be extremely spammy and lacking in actual content. Seems less prevalent these days.
I think there may be additional insights on their announcement post: https://blogs.office.com/2015/08/31/introducing-office-ui-fa...