DOMStringMap

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Used by the dataset HTML attribute to represent data for custom attributes added to elements.

`DOMString getDataAttr(in DOMString prop);`
`boolean hasDataAttr(in DOMString prop);`
`void removeDataAttr(in DOMString prop);`
`void removeProp(in nsIAtom attr);`
`void setDataAttr(in DOMString prop, in DOMString value);`

boolean hasDataAttr(
  in DOMString prop
);

true if the property exists; otherwise false.

void removeDataAttr(
  in DOMString prop
);

Removes the property from the dataset object. Used to update the dataset object when data-* attribute has been removed from the element.

void removeProp(
  in nsIAtom attr
);