Zoom Works :

CSS zoom works based on attribute value provided to the zoom attribute.
If we pass zoom attribute value as normal then size becomes 100%.
If we pass zoom attribute value as reset then it will reset back to original size from user custom values like 120%, 70%, 150%, etc.


Syntax :
element
{
zoom:normal/reset/120%,70%/custom % values;
}

Accepted Values with zoom attribute: normal: It does not change the normal size of the element. It is the default value.
reset: It reset to the actual 100% size.
custom % values: If you want explicitly provide custom values like 70%, 80%, 120%, 150%, etc then use this percentage with zoom attribute.
If we give percentage >100 then content size increases, if we give a percentage < 100 then the size of the content reduces.