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Re:The anatomy of a credit card form by xentronium on Wednesday July 15, 2015 @05:59AM (#9890516)
Judging from the screenshots with filled inputs, they automatically add spaces making the card number look exactly like it is on the physical card.

https://medium2.global.ssl.fastly.net/max/800/1*QzxyS4KGIvCw...

Re:The anatomy of a credit card form by tomp on Wednesday July 15, 2015 @06:14AM (#9890548)
The live demo linked flat the end of the blog post makes a feeble attempt to insert a space after the first 4 digits, but ultimately fails (on Firefox 38 on Windows).
Re:The anatomy of a credit card form by calebegg on Wednesday July 15, 2015 @01:03PM (#9892502)
Probably because you didn't enter a valid card number. Try something that starts with '42' (for a Visa card). It works for me with a valid number.