Javascript training - learn how to access element by tagname - Javascript tutorial for beginners

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For access elements using tag name.
we use document dot get element by tag name.
which returns an array.
No matter there is 1 element with that tag name or more we access is like array.
for access first elements use 0th position.
for access second element use 1st of array etc.
In this tutorial we create a textbox and a button and a function which alert current accessed element value.
on onclick of button we alert value of textbox.
We will use input for access tag name.
So, array will return two element.
zeroth position will point textbox
and 1st position will point button

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