In CSS I routinely set box-sizing to border-box (to make the browser use the border-box model) and for IE 7-8 I manually adjust the height/width of elements that display differently (highly visible and easy to solve).
For simplicity, I use an IE conditional statement to lump IE7 and IE8 together, so I can use the 'ie78' class in CSS to modify them. However, IE8 is just different enough, from IE7 that the occasional incompatibility crops-up. It occurred to me
that I could create a rule for ie7-8 to both use the content-box model.
My question is, will IE8 render exactly the same as IE7 in this case, so I only need two IE rules (one for ie9 and one for ie 7-8)?