Is it possible to add a condition class to the master page?

Question

I want to add the class ms-hideto the body of my master page depending on certain conditions.

I'm trying to do something like delegate controls where, based on a feature I add or remove this class from my body.

I'm doing a lot of DOM manipulation on my project sites and I want to hide the body until it's ready then fade it in.

Answer 1

One option, showing the power of CSS

add a STYLE tag to your document, preferably in the HEAD, but can be placed anywhere

<style id="hiddenHTML">
  :root body{
     visibility:hidden;
   }
</style>

This hides the body tag, but you can still do DOM manipulations

Once you are ready you disable the whole STYLE definition

document.getElementById('hiddenHTML').disabled=true;