About: http://webisa.webdatacommons.org/450036795

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Limitations: ... the element is expected to appear button-like to indicate that the element is a button. which Chrome follows and renders a 4x4px empty square when no text
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com