recordSetVar in Visualforce page

The recordSetVar attribute not only indicates that the page uses a list controller, it can indicates the variable name of the record collection. This variable can be used to access data in the record collection.

Sample code:

<apex:page standardController="Account" recordSetVar="accounts" tabstyle="account" sidebar="false">
    <apex:pageBlock >
        <apex:pageBlockTable value="{!accounts}" var="a">
            <apex:column value="{!}"/>

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