Background information: The WHATWG HTML standard defines aMicrodata API that allows authors to embed machine-readable metadata in web content. The goal of this work is to implement the fundamental pieces required to support this API.

Tracking issue:https://github.com/servo/servo/issues/18528 (please ask questions here)

Initial steps:

• email themozilla.dev.servo mailing list (be sure to subscribe to it first!) introducing your group and asking any necessary questions
• edit the HTMLElement interface to add theitemscope anditemprop attributes.
• Implement stub methods for the attributes incomponents/script/dom/htmlelement.rs.
• hide the new attributes by default by adding a[Pref="dom.microdata.enabled"] attribute to each one in the WebIDL file and add a corresponding preference toresources/prefs.json
• create new directoriestests/wpt/mozilla/tests/mozilla/microdata andtests/wpt/mozilla/meta/mozilla/microdata which will include any tests you write.
• add a__dir__.ini file totests/wpt/mozilla/meta/mozilla/microdata whichenables the new preference.
• tests can now beadded totests/wpt/mozilla/tests/mozilla/microdata.
• implement the microdata attributes, by adding fields to theHTMLElement foritemscope anditemprop.

Subsequent steps:

• implement and test the algorithm toextract JSON from microdata.
• implement and test the algorithm toextract a vCard from microdata.
• use these algorithms to extract metadata from each page after it finishes loading and send it to the compositor
• notify any embedding code of the newly-extracted metadata
• modify theservoshell embedding to use the new notification and create a vCard file if available