Macro span 

span!() { /* proc-macro */ }

Available on crate features http and html only.

A generic inline container for phrasing content, which does not inherently represent anything. It can be used to group elements for styling purposes (using the class or id attributes), or because they share attribute values, such as lang. It should be used only when no other semantic element is appropriate. span! is very much like a div element, but div is a block-level element whereas a span! is an inline-level element.