What's wrong with w3schools? I occasionally find their site useful for basic HTML stuff and it seems inoffensive enough, certainly compared to others mentioned here (Quora, LinkedIn, Pinterest et al)
Are you sure about that? I literally received their daily digest which has the price-per-article, as expected, just a few hours ago. Maybe they are now offering both?
The biggest problem I’ve had with Blendle is that I want to read an NYT article due to a recommendation, not because I go to their app. I just would forget to go there. There was no “open with blendle” option to move into my flow.
The original article (https://www.washingtonpost.com/nation/2019/07/26/it-snuck-up...) includes links to some interesting background information, including the event leveling a huge forest area. And it correctly uses square km/miles instead of "square acres".
I hope they pin on the key, not the certificate. For a mobile app I worked on, I had it pin the public key on the leaf certificate and indeed it would fail to connect in this scenario.
For mobile apps, though, you can bootstrap HPKP with a key built into the app. I worked on an app doing this, and it would certainly fail to connect in this scenario.
One solution is to use Name Constraints. The organizational certificate authority could be issued with Name Constraints limiting its power to a certain domain name only, e.g. *.example.com, using Permitted Subtree.
If I was setting up an organizational CA for internal websites (not MITM), I would consider using Name Constraints to limit the certificate's scope and potential for abuse or compromise.
For U2F there's nothing to be in sync: each key is added individually, and you don't have to add all of them at once. I.e. if you register the key on your keychain at work, you could later add the backup key in your home vault.
For storing TOTP keys on your YubiKeys, those must be the same, so you probably have to add them at the same time, or take a picture of the QR-code before you complete the registration.
> For U2F there's nothing to be in sync: each key is added individually, and you don't have to add all of them at once. I.e. if you register the key on your keychain at work, you could later add the backup key in your home vault.
The challenge is remembering to enroll using your backup device. Also, ideally your 2 devices would never be in the same room as each other, otherwise you are at risk of something like a fire destroying both.