Any page on the wiki that uses javascript ‘flashes’ content before the final javascript has been implemented. It is getting worse for the GuidedResearch pages since we have added quite a bit of content inside the dropdown areas. See https://beta.familysearch.org/wiki/en/User:Ahancey/sandbox-GR.
I found the following code, when searching the internet for a solution, and wondered if something this simple could be implemented. At the beginning of a page load, add the following:
html{visibility: hidden;opacity:0;}
Then at the bottom of the page load, add the following:
html {visibility: visible; opacity: 1;>}
Adding this to Common.css wouldn’t work, but maybe adding it to the backend .css file?!
I found this solution at https://petrey.co/2017/05/the-most-effective-way-to-avoid-the-fouc/