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Avoided using `closest` as not supported by IE8-11 https://caniuse.com/#search=closest Used `parentElement` supported by IE9+ https://caniuse.com/#search=parentElement Used `className` as supported by IE9+ https://caniuse.com/#search=className Also rearranged the javascript for maps such that figuring out the polygon array is done first and then the time when we need to have the details component open before closing it again is kept to minimum