What does this statement means in javascript? [closed]

Its sets the attribute to a DOM element using attr method of jquery.

In your example, you are setting href and rel attribute to an element which is matching the selector '#myDiv a:first'.

‘#myDiv a:first’

It means if there is a div with an id myDiv, it will take its first child element which is an anchor (a) and apply these attributes to it.

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