Is using font-size: 100.01% still needed, and for what browsers?

Question

I'm cleaning up some old and terrible css, which includes:

body {
  font-size: 100.01%
}

While researching, I found body { font-size: 100.01%; } vs body { font-size: 100%; }?, which explains the reason for setting font-size to 100.01%, but doesn't tell what browsers this 'fix' targets.

Do any modern browsers still face this issue, and if so, which and what versions?

Answer 1

Answer taken from CSS: Getting Into Good Coding Habits by Adrian Senior

This odd 100.01% value for the font size compensates for several browser bugs. First, setting a default body font size in percent (instead of em) eliminates an IE/Win problem with growing or shrinking fonts out of proportion if they are later set in ems in other elements. Additionally, some versions of Opera will draw a default font-size of 100% too small compared to other browsers. Safari, on the other hand, has a problem with a font-size of 101%. The current "best" suggestion is to use the 100.01% value for this property.