of ExpressionThe of expression lets you reverse the normal order of property access for more natural, readable code. Instead of window.location, you can write the location of the window.
So this:
<button _="on click call window.location.reload()">
Reload the Location
</button>
Can be rewritten like this:
<button _="on click reload() the location of the window">
Reload the Location
</button>
Where we have converted window.location into the form the location of the window.
<expression> of <expression>