Good Question,I do know the exact answer but my answer may be helpful in someway yet.
I myself have used web page printouts in one of my case (Voter card of the opponent) ,I have written the exact URL of that print out and also the web route from the Home page of the particular site to that particular page.Also noted down the date of the printout
I am quite sure that if we are using printouts of web pages of a Govt.site in this way,Courts had to consider them as valid because it is a document which can be confirmed even by a Kid of 12 years just by a few clicks.
So I suggest,make use of web material as much as possible but taking a few precautions as suggested by me.
Plz. give me a feed back about my answer
And
I also request to other Advocate friends render their opinions.