how to set checkbox as checked in html code example

Example 1: how to set checkbox checked

<input type="checkbox" name="vehicle3" value="Boat" checked>

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Example 2: html checkbox default checked

<!-- Add checked tag  -->
<input type="checkbox" name="vehicle3" value="Boat" checked>

Example 3: get the state of a checkbox

function checkAddress()
{
    var chkBox = document.getElementById('checkAddress');
    if (chkBox.checked)
    {
        // ..
    }
}