Javascript pathname referrer

No, you can only extract needed part manually:

document.referrer.replace(/^[^:]+:\/\/[^/]+/, '').replace(/#.*/, '')

You can extract the pathname from the document.referrer and parse it with new URL() with the following code

const url = new URL(document.referrer)
url.pathname

Be sure to polyfill URL for IE 10 and below, easily done with https://polyfill.io/v3/polyfill.js?features=URL