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Questions regarding responsive site


I want to redesign a site for responsive and have 2 questions:

1-What is the standard size (min-max) for mobile,tablet,and desktop?please write the @media query for each one,my mean is only determine min and max for each device that cover also the
for mobile.

2-For a website with medium size  (php+mysql) that we want be responsive is it better that for each device we create one css file so 3 css files for website or one css file is ok that we put all 3 @media queries in that?

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Eric C
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Consider using/learning Bootstrap or Foundation. These responsive frameworks come with all of the media quieries/break points. Because they've been around for a while and are (very) popular, they seem to have adopted a 'standard'.

Here are the breakpoints that Bootstrap uses:
< 768   extra small
>= 768  small
>= 992 medium
>= 1200 large  shows the media queries.
And yes, you can put them all into one style sheet.

You can of course change these if you have a specific application.


Thanks,yes i know about Bootstrap or Foundation but i prefer to have my own design and use from some components of Bootstrap or Foundation like 'navigation'.

I want put breakpoints in  media query for 3 devices(mobile-tablet-desktop) in css file,please write the correct media query for these 3 devices.

For example for mobile (this is an example ,please writ the right and common amount in pixel :
@media ( max-width:580px){
There are two schools of thought when it comes to responsive design
   - mobile-first (recommended)
   - desktop-first

Here are some breakpoints you can start with, using the mobile-first approach:

/*==========  Mobile First Method  ==========*/

/* Custom, example, smallest minimum breakpoint */ 
@media only screen and (min-width : 320px) {

/* Extra Small Devices, Phones */ 
@media only screen and (min-width : 480px) {

/* Small Devices, Tablets */
@media only screen and (min-width : 768px) {

/* Medium Devices, Desktops */
@media only screen and (min-width : 992px) {

/* Large Devices, Wide Screens */
@media only screen and (min-width : 1200px) {

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Yesterday i had a question in this regard that "must we design first for mobile or desktop?" but because nobody answer it i thought that it is a potty question and then i deleted that Q!!.

But it is important as you said,so i have some question regarding your codes:

-The order of @media{} in css file is important for  mobile-first (recommended) or desktop-first?

-Is it possible that we combine the codes so we have one @media{} for each device?
Because i think in my case it is no different between 320px and 480px(for mobile) ,but like that site be good in these ranges,so putting @media{max-width=480px}  for mobile cover all size below also? or we must set separately for 320px and 480px?
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Eric C
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Thank you very much.