Usage: SITE_URL/?k=YOUR_SECRET
Replace 'YOUR_SECRET' with your your own TOTP secret, and 'SITE_URL' with the URL of this link.

For frequent use, you can bookmark this URL, 
Or conviently this line of code can help you quickly run a popup window:

/* COPY BELOW */
javascript:(function(s){ window.open('YOUR_URL','','popup,width=100,height=100')})();
/* COPY END */

Replace 'YOUR_URL' to the composed URL above, then paste into your bookmark address.


To format:
Pass 'f=1' into parameters to see some HTML.
Omit this parameter unsets it.
The close button cannot close a window opened manually. Use this with bookmark script is ideal.


For advanced usages,
Pass those as URL parameters:
a:algorithm, default is SHA-1
d:digits, default is 30
p:peroid, default is 6
t:timestamp, default is current time.