Thu, 2015-09-10 09:02
I often see em's used in place where really it should have been pixels ex.
@media only screen and (min-width: 35em) { /* Style adjustments for viewports that meet the condition */ }
now why would somebody use em's like that ?? how does the author know how much is 35em's really going to be ? i guess when your setting a media query you need to know mentally what screen size that media query is going to be activated at , now if you say 35em , what screen size would that mean ..... ??? i just don't get it , why do people use em's in media queries ?
P.S. :: I know the web would is moving away from pixels to em's and rems 
Thu, 2015-09-10 17:24
#1
Proportionality
Using 'em' makes dimensions proportional to the user's preferred font size. It has its rationale, but I probably agree with you that media queries are better served by pixel bounds; the viewport doesn't care what the font size is.
That said, I haven't really worked through the em based queries enough to talk intelligently about them. Generally, I prefer to set wrapper, column widths, &c. by percentage and break-points by px. {shrug}
cheers,
gary
Sun, 2015-09-13 11:50
#2
Thanks for your views gary
Ok. thanks for your view gary, anyways , the world seems to be obsessed with em's and so pretty soon i guess even for media-queries i will migrate to em's.