compare the two screenshots below, in each app and browser, of the following article section:
https://en.wikipedia.org/wiki/Polygonal_chain#Notes
it's because of the following code snippet:
{{Notelist|refs=
{{Efn|name=Names|A polygonal chain may also be called a '''polygonal curve''',<ref name=ref1/> '''polygonal path''',<ref name=ref2/> '''polyline''',<ref name="ecg"/> '''piecewise linear curve''',<ref name="ecg"/> '''broken line'''<ref name=ref4/> or, in [[geographic information system]]s, a '''linestring''' or '''linear ring'''.<ref name="OGC"/>}}
}}