Posting here because I know the webmaster of gridwatch is a resident, and may or may not be aware of some minor issues.
On the gridwatch website there are info bubbles which pop up when you mouse over various dials.
With my normal setup (Win 10 and Firefox or Maxthon) the size of some of the speech bubbles is too small for the text they contain. For example the last visible words in the "wind" bubble are " The variability of wind leads to" and for Nuclear "Are generally signs that refuelling or".
I have checked with Opera, Chrome and IE and they all have large enough bubbles for the text they contain to be read and they work fine.
The new edge browser however, that is a bit chaotic if the window is to small to get in all of the dials, it attempts to reposition the dials without rescaling them and makes a bit of a mess. If the window is large enough it works fine.
If you are not aware of the issues I hope this is of some help.