This visual is intended to be a spiritual successor to the HTML Viewer visual. All original functionality has been retained in that you can define your HTML in columns and add them to the visual and Power BI will attempt to render this for you. This allows you to add richer custom content to your reports.
This version also provides several enhancements that were popular feature requests to the original visual:
Refer to the visual's usage page (https://bit.ly/powerbi-html) for a guided example using these new features, or refer to the sample workbook.
For those who are more web development-savvy and want to attempt more advanced content, a lot of the limitations that the original HTML Viewer visual had will still exist in this one; this is specifically to do with a number of restrictions imposed upon custom visual permissions by Power BI.
While the visual will have a good go at rendering the HTML content you supply, it only only passes your content into the DOM on your behalf. Therefore, you will need to bear the following in mind: