knockout.js - knockout binding how to remove an attribute -


let's have html element

<element testattribute='a'></element>

i know can pass value of testattribute using binding this:

<element data-bind="attr: { testattribute: 'a'}></element>

but how can remove attribute through binding. if original value 

 <element testattribute: 'a'></element>

my end result should 

<element></element>

the attr binding in ko remove attribute if value false, null, or undefined. so, if bind against observable , set 1 of values (not empty string), attribute removed.


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