Using emoji in aliases (possibly also labels an descriptions) breaks the width of the columns in Chrome. It seems that the problem does not appear in other browsers.
See e.g. https://wikidata.beta.wmflabs.org/wiki/Q515698?useformat=mobile
Possibly related: https://stackoverflow.com/questions/42016125/emoji-rendered-in-chrome-have-different-widths-than-in-other-browsers