Draft technical documents can be reviewed by stakeholders. Stakeholders can be fellow practitioners, industry specialists, senior managers, regulators, and so on.
The purpose of a stakeholder review is usually to receive feedback in the form of comments. The comments can be compiled by whoever is managing the documentation project and be used to improve the document prior to publishing.
Comments have traditionally been collected on a comments form that is supplied with a draft. Comments can also be returned as notes attached to a PDF.
These methods have a low barrier to entry and are useful for a wide-reaching review. But these methods are becoming obsolete as content is developed on the web.
What is the best modern practice to collect comments on a draft?