Element Information Card Widget Example
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Note that the URL hash parameter matching is rather flexible, and can be used to display a list of multiple elements that match element symbols or names. For instance, using matching=C will display all elements that have the name or symbol which begins with letter "C". Using a number, however, will only match the atomic number exactly. Thus, using matching=2, will only display Helium.
If you are interested in displaying a single element only, either use the full name or the atomic number of the element.