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HTML Guide for data attributes

Attribute “currency” not allowed on element “span” at this point.

span
currency
data attributes

The <span> element does not have a currency attribute. Consider using custom data attributes instead, like data-currency.

Attribute “st_title” not allowed on element “span” at this point.

st_title
span
not allowed
data attributes

The attribute st_title is not allowed on <span> elements.

This issue is commonly caused by an old integration of ShareThis via Drupal or other CMS - the old code used invalid attributes like displayText, st_url and st_title which were later changed to HTML5 custom data attributes.