I'm setting up a custom popup using HTML tags that will allow my data to be displayed in table format (see image below). Once I hit save on the map and refresh, the HTML formatting seems to not work and the HTML text is displayed within the popup itself. Am I configuring my HTML incorrectly? How can I get my HTML to stick and display my custom popup.
This is the popup window with the working HTML configured.
This is the popup window after saving and refreshing the browser page.
I had this happen to me when I was trying to use an unsupported HTML tag - it would display at first but wouldn't save after refresh.
You can check out this page to see what's supported within ArcGIS:
Are you using anything not listed on that page?