Sign-up panel mails you a rain check
On a phone, the sign-up panel now takes your email and sends you one with a link back to the page you were reading. Open it on your desktop, sign in with GitHub, and carry on.
Tap a trending commit on your phone and the panel slides up as always. Join with GitHub sits at the top, and beneath it a line that wasn't there last week. Not on your computer? Email me a link. Tap it and the panel folds down to one field, the keyboard rising with the sheet riding on top instead of hiding behind it. Type your address, hit Send, and the panel says Sent. See you on your computer.
Credit goes to mnapoli, who built the round trip. The email carries one link back to the exact page you were reading, query string and all, so long as that address stays under 2,000 characters. An address gets one email every 30 days. An IP address gets three an hour. The site keeps only a keyed hash of your address for those 30 days, the queue holds the message encrypted, a hidden field catches bots, and the panel answers the same way whether the mail went out or not.
One catch. Ask again inside 30 days and nothing is sent, yet the panel still says Sent. The 30-day marker is written before the message is queued, so a bounced email or a typo locks that address out for the month. Type another address, or wait.