How is min-width media query rule s mobile first approach - html

They always say that min-width #media rule is the way to build for mobile first, I have read plenty articles about it but i still can't understand how exactly min-width rule works> But the max-width is easy and lends itself to easy comprehension.
#media only screen and (min-width: 400px) {....some rule here.....}
#media only screen and(min-width: 900px){......some rule here....}
my question and confusion is: can one used both breakpoint on the same stylesheets? and how does it make for mobile first ?
I need a tolerable responses please, no down voting for those who enjoy down voting please be tolerable and nice enough to help put.

Indeed its true using min-width helps to make a web mobile first.
Let us take an example.
We are creating a web that will scale to two viewports say 300px, 300px+ devices.
1) using min-width
body {
background: yellow;
}
// 300px+ devices
#media (min-width: 300px) {
body {
background: red;
}
}
Here background-color is been overridden for 300px+ devices
2) using max-width
body {
background: red;
}
// 300px- devices
#media (max-width: 300px) {
body {
background: yellow;
}
}
Here background-color is been overridden for 300px- devices
Now down the line in your App timeline you need to support 600px+ devices
3) using min-width
body {
background: yellow;
}
// 300px - 600px devices
#media (min-width: 300px) {
body {
background: red;
}
}
// 600px+ devices
#media (min-width: 600px) {
body {
background: green;
}
}
New media query added to support 600+ devices, no changes needed in the existing style sheet.
4) using max-width
body {
background: green;
}
// 600px- devices
#media (max-width: 600px) {
body {
background: red;
}
}
// 300px- devices
#media (max-width: 300px) {
body {
background: yellow;
}
}
Although we needed additional media-query rule to support 600+ devices, but we needed to change the global body background-color to support new breakpoint.
Now compare 1) with 3) and 2) with 4) ,
you will notice to support new breakpoint
for 1 to 3 we didn't need to change existing style rules, just added new rules over it.
but for 2 to 4 existing rules were modified to support new breakpoint
Summary
so min-width ensures future friendly and progressive enhancement (mobile-first)
but max-width leds to short-sighted approach and needs degradation (mobile-last)

Related

(html) How do I hide my navbar when my website is viewed on mobile?

Is there a way to do this with html and css or can I only do it with javascript/bootstrap? I'm fairly new to coding so detailed explanations if possible would be nice!
You can do that with css media query. If you are begineer here is a small tutorial on that CSS media query.
According to mobile device size you can hide the navbar.
EXAMPLE:
#media only screen and (max-width: 600px) {
.navbar{
display:none;
}
}
You can hide show with the help of #media screen to show or hide the code in different devices sizes.
Examples:
#media screen and (max-width: 767px) {
.hide_on_mobile {
display: none;
}
}
#media screen and (min-width: 768px) {
.hide_on_mobile {
display: block;
}
}
Yes you can.
There several approaches to do that
Detect device is touchable (e.g. with Modernizr like tools) - I do not recommend, cause nowadays event laptops provided with touch displays.
By device's viewport - here's the good table list with most popular devices viewports by Adobe
I prefer second approach
So the solution comes in hand with CSS media-queries
And read about mobile first techniques
Example (press the Full page button after running snippet to look how it's gonna look in desktops)
<style>
#navbar {
display: none;
}
#media (min-width: 640px) {
#navbar {
background: lightblue;
height: 60px;
}
}
main {
background: #ccc;
min-height: 40vh;
}
</style>
<div id="navbar"></div>
<main></main>

Display currently active media query rule in Firebug

Is it possible in Firebug (Firefox Web Development add-on) to display which media query rules are currently active?
E.g.: I monitor a div element as usual. Then I scale the browser window to be smaller than 400px (or use the Firefox web dev screen size tool). I want to see a list of rules that are currently active for this element like this.
#media screen and (max-width: 400px) {
div { float: left }
}
Is that possible with Firebug or a similar tool?
You can use something like this, to show what mediaquery is currently working, please update with your mediaqueries:
The div will print what mediaquery is 'on', so you can hide the div, and use it only for development purposes.
#media (min-width: 400px) {
.mediaq:after {
content:'min 400'
}
}
#media (min-width: 800px) {
.mediaq:after {
content:'min 800'
}
}
#media (min-width: 1200px) {
.mediaq:after {
content:'min 1200'
}
}
<div class="mediaq"></div>

Using CSS to selectively display content, avoiding conflicts

I'm using CSS to selectively display content depending on viewport size. E.g.:
CSS:
.hires, .midres, .lowres {
display: none;
}
#media only screen and (min-width: 801px) { /* hires, desktop */
.hires {
display: inline;
}
}
#media only screen
and (min-width: 600px)
and (max-width: 800px) { /* mid res, tablet */
.midres {
display: inline;
}
}
#media only screen
and (min-width: 320px)
and (max-width: 599px) { /* Low res / smartphone */
.lowres {
display: inline;
}
}
HTML:
<p class="hires">Resolution: high.</p>
<p class="midres">Resolution: medium.</p>
<p class="lowres">Resolution: low.</p>
<p>This paragraph will always be displayed regardless of resolution.</p>
Which works, but only up to a point. When it comes to images, it turns out that I've neatly painted myself into a corner here. Because somewhere down the line there's something like:
CSS:
#media only screen
and (min-width: 320px)
and (max-width: 599px) { /* Low res / smartphone */
img {
float: none;
display: block;
width: 100%;
height: auto;
}
}
Which means that in the following case:
<img src="foo.jpg" class="hires" />
the image is always displayed regardless of viewport size, because the 'display: block;' overrides (conflicts with, really) the preceding rules to selectively display the image or not.
Unfortunately 'display' has no opposite of 'none'. I can't use 'visibility' because that will still leave a gap where the hidden content used to be. I could use jQuery to show() and hide() content, but I'd rather not move part of my styling from the style sheets (where it belongs) to Javascript (where, strictly speaking, it doesn't).
Unfortunately I noticed this little snafu only now, quite a way into the project. Which means I'm an idiot. :-)
What would be the best way to deal with the above issue?
You could either wrap images in something with the class lores or use img.lowres as selector in your css, ie
#media only screen
and (min-width: 320px)
and (max-width: 599px) { /* Low res / smartphone */
img.lowres {
float: none;
display: block;
width: 100%;
height: auto;
}
}

Media Queries not working at all whatsoever

I am in despair. I am trying to make a website and make it mobile-friendly and responsive, however, I cannot seem to get any kind of media query to work at all! All my sizes, width and heights are in "%/em" and my font-sizes are in "vw/em". The biggest problem I get is that, as the screen shrinks, so does my text, to the point where it simply becomes eye-straining to read! I don't see relevant to send any code but if need be, I shall send some of my code (my website is still offline and I cannot put it out there if this problem isn't fixed).
Here's what I have tried:
I have tried putting this in my tag:
<meta name="viewport" content="width=device-width, initial-scale=1">
No success when I try media query in a tab or in a separate css stylesheet.
I have tried removing it aswell.
I have tried these media queries for my font-sizes:
#media (max-width: 400px) {
body { font-size: 60%;}
}
#media only screen and (max-device-width: 800px) {
body {
font-size: 80%;
background-color: blue;
}
}
#media (max-width: 1100px) {
body { font-size: 120%;}
}
I have also tried other media queries but absolutely NOTHING changes at all! Am I doing something wrong? Probably but what?!! This is leading to so many problems! I cannot change my header according to different screen sizes, I cannot change my display, my header links are a mess, etc.
Also, please note that I am a beginner and I do not use any javascript, bootstrap or whatever.
Thank you in advance for your help!
Your queries are a little weird. Perhaps with some logical constrains you can achieve what you are looking for? This is what I mean:
#media (max-width: 400px) {
body{
background-color: yellow;
}
}
#media (min-width: 401px) and (max-width: 800px){
body {
background-color: blue;
}
}
#media (min-width: 801px) and (max-width: 1100px) {
body {
background-color: purple;
}
}
#media (min-width: 1101px){
body{
background-color: orange;
}
}
In my humble opinion, setting the intervals using both min-width and max-width help me visualize what's going on better. This pen shows the colors changing whenever you change the width. It doesn't do much good, but it's something to get started with media queries.
EDIT:
Pen contains transitions between colors because cool
Usually, it's better to use media queries based on minimum screen width. Here is an working example with the code you posted:
Codepen: http://codepen.io/anon/pen/eNJXXp
#media (max-width: 400px) {
p { font-size: 60%;}
}
#media (min-width: 400px) {
p {
font-size: 80%;
background-color: blue;
}
}
#media (min-width: 800px) {
p { font-size: 120%;}
}

website responsive showing good in firefox but not in mobile?

I can't figure out the issue. I searched a lot and after that. I am here for help so guys please help me. Below is the HTML I use:
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0">
and these are the media queries
#media all and (max-width: 1400px) { }
#media all and (max-width: 1024px) { }
#media only screen and (max-width: 768px) { }
#media only screen and (max-width: 480px) { }
#media only screen and (max-width: 320px) { }
Help me identify what is wrong.
#media all and (min-width: 1400px) {
}
#media all and (max-width: 1399px) and (min-width: 1024px) {
}
#media all and (max-width: 1023px) and (min-width: 768px) {
}
#media all and (max-width: 767px) and (min-width: 480px) {
}
#media all and (max-width: 479px) and (min-width: 320px) {
}
#media all and (max-width: 319px) {
}
This in <head></head>
<meta name="viewport" content="width=device-width, user-scalable=no" /> <-- user-scalable=yes if you want user to allow zoom -->
change you #media style as this // change width as per your requirements
#media only screen (max-width: 500px) {
// or as per your needs, as I try to explain below
}
Now I try to explain maybe..:)
#media (max-width:500px)
for a window with a max-width of 500px that you want to apply these styles. At that size you would be talking about anything smaller than a desktop screen in most cases.
#media screen and (max-width:500px)
for a device with a screen and a window with max-width of 500px apply the style. This is almost identical to the above except you are specifying screen as opposed to the other media types the most common other one being print.
#media only screen and (max-width:500px)
Here is a quote straight from W3C to explain this one.
The keyword ‘only’ can also be used to hide style sheets from older user agents. User agents must process media queries starting with ‘only’ as if the ‘only’ keyword was not present.
As there is no such media type as "only", the style sheet should be ignored by older browsers.
I try to put some more information here, gathered from web.
If
That's what media queries are: logical if statements. "If" these things are true about the browser, use the CSS inside.
And
The keyword and.
#media (min-width: 600px) and (max-width: 800px) {
html { background: red; }
}
Or
Comma separate.
#media (max-width: 600px), (min-width: 800px) {
html { background: red; }
}
Technically these are treated like to separate media queries, but that is effectively and or.
Not
Reverse the logic with the keyword not.
#media not all and (max-width: 600px) {
html { background: red; }
}
Just doing not (max-width: 600px) doesn't seem to work for me, hence the slightly funky syntax above. Perhaps someone can explain that to me. Note that not only works for the current media query, so if you comma separate, it only affects the media query it is within. Also note that not reverses the logic for the entire media query as a whole, not individual parts of it. not x and y = not (x and y) ≠ (not x) and y
Exclusive
To ensure that only one media query is in effect at time, make the numbers (or whatever) such that that is possible. It may be easier to mentally manage them this way.
#media (max-width: 400px) {
html { background: red; }
}
#media (min-width: 401px) and (max-width: 800px) {
html { background: green; }
}
#media (min-width: 801px) {
html { background: blue; }
}
Logically this is a bit like a switch statement, only without a simple way to do "if none of these match do this" like default.
Overriding
There is nothing preventing more than one media query from being true at the same time. It may be more efficient to use this in some cases rather than making them all exclusive.
#media (min-width: 400px) {
html { background: red; }
}
#media (min-width: 600px) {
html { background: green; }
}
#media (min-width: 800px) {
html { background: blue; }
}
Media queries add no specificity to the selectors they contain, but source order still matters. The above will work because they are ordered correctly. Swap that order and at browser window widths above 800px the background would be red, perhaps inquisitively.
Mobile First
Your small screen styles are in your regular screen CSS and then as the screen gets larger you override what you need to. So, min-width media queries in general.
html { background: red; }
#media (min-width: 600px) {
html { background: green; }
}
Desktop First
Your large screen styles are in your regular screen CSS and then as the screen gets smaller you override what you need to. So, max-width media queries in general.
html { background: red; }
#media (max-width: 600px) {
html { background: green; }
}
You can be as complex as you want with this.
#media
only screen and (min-width: 100px),
not all and (min-width: 100px),
not print and (min-height: 100px),
(color),
(min-height: 100px) and (max-height: 1000px),
handheld and (orientation: landscape)
{
html { background: red; }
}
Note the only keyword was intended to prevent non-media-query supporting browsers to not load the stylesheet or use the styles. Not sure how useful that ever was / still is.
And for media queries priorites
sources : one two three four five
If you have not defined css properties for different medias, how do you expect the browser to render it?
You need to for example:
#media only screen and (max-width: 480px) {
#header
{
width:100%
background:red;
}
}