Javascript for adding a custom attribute to some elements

Question

Given a section of HTML, can I selectively pick some types of elements (e.g., input) and add a custom attribute using JavaScript? I would also need to remove this attribute if i

Answer 1

You can look here how to get and set the attribute.

https://jsfiddle.net/tuc57hbp/6/

to get attribute you must first get the value. Then you must get it's input children using td.children[0] and set the input children attribute value using input.setAttirbute('dummy', 'value'). Then retrieve it using getAttribute('dummy').