This is a test of the Faithlife Reftagger. You can see how it handles each of these type of text references.

• Mark 6.34 (using period separator)
• Mark 6:34 (using colon separator)
• Mk 6:34 (using abbreviation)
• John 3:16-17 (using multiple verses)
• John 1:1, 14; 2:1 (complex listing)

The Faithlife Reftagger does allow for considerable customization, including styles as well as a choice of Bible versions.

Here is the popup:

In addition to the social media links in the upper right, note that clicking on "more" brings you either to the Biblia.com or Faithlife Study Bible site (option chosen in customization).

Compare this to:

• ESV CrossReference Tool
• NETBible Tagger