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VF page blank after preview. I am new to VF pages and practicing for the same. Preview opens a blank window. Please help

Hi, I am learning VF pages. and  my first VF page preview showing blank. Please help how to resolve. 
Raj VakatiRaj Vakati
You need to pass the records id to the preview URL  like below 

<YOUR_URL>/apex/pagename?id=<recordId>