Develop Reference

Vertically center in div differs on mobile vs desktop?

I've been trying to center a number inside of a circle, and I just can't quite get it. Every time I think I have it, it seems like it on some platform it doesn't work (whether it's an apple phone, an android browser, Safari on Mac OS X, or Chrome / Firefox on Windows) there's a 1-2 pixel difference.
Here's the code:
.unread-replies {
display: flex;
justify-content: center;
text-align: center;
align-items: center;
background-color: #F24648;
border-radius: 50%;
width: 25px;
height: 25px;
font-weight: 500;
color: white;
font-size: 17px;
border: 1px solid #00000066;
}
* {
box-sizing: inherit;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji" !important;
}
<div class="unread-replies">1</div>
Fiddle copy here: https://jsfiddle.net/3vr2mkfb/3/
In this case it seems like it's not vertically centered on Chrome in my desktop browser, but it is vertically centered on Chrome on my Android phone. Why the discrepancy?
If I try small hacks like padding-bottom: 2px; then it inevitably causes some problem on some other platform. I think I instead need the actual fix, but I don't know if there is one?

add some line-height with the same value as the font-size and see if it fixe anything.

Use Viewport Units like vw for width and vh for height instead of px and % because it will help you make your webpage/website responsive.
It will surely solve your issue but if it doesn't let me know in the coments I will try my best to help you.

Why isn't Android WebView rendering CSS accurately?

Before anyone thinks this is a simple question or is a possible duplicate, please read the full post.
I'm developing an Android application and have implemented a WebView to act as part of the application. The WebView shows content from a website which is made with bootstrap and is mobile friendly. However, the CSS messes up here and there and as a result, the entire application looks odd and elements seem to be 'out of place'.
For example, I place a box and some text inside a container and place it specifically using CSS margins. Like below:
.testcontainer {
border: 1px solid red;
height: 50px
width: 100%;
}
.testcontainer .box {
height: 50px;
width: 50px;
background-color: blue;
display: inline-block;
vertical-align: top;
}
.testcontainer .text {
font-size: 16px;
display: inline-block;
vertical-align: top;
border: 1px solid blue;
}
<div class="testcontainer">
<div class="box"></div>
<div class="text">Testing</div>
</div>
Now all is good on a MacBook Safari and Opera browser and the text's border is pixel perfect and is aligned with the top of the blue box etc. However, on the WebView inside the application, the text is around 2px off and in some cases, 5px and so on. Why? I've tried to use em instead of px for font-size but the same issue occurs. What am I missing?

Is nested <div> in Chrome for Android not supported?

I have scoured the web for simple ways to make a progress bar on a website that is consistent across all browsers. I have achieved this for PCs by using elements instead of the progress element and thought all was well until I looked at the website on my android phone using chrome browser app.
It would appear that Chrome for Android does not support this code?!
Can someone point me in the right direction to get this to appear correctly?
#percent {
background-color: black;
border-radius: 10px;
padding: 3px;
color: yellow;
height: 38px;
}
#inner {
background-color: white;
border-radius: 8px;
height: 100%;
width: 100%;
float: right;
}
#bar {
background-color: cyan;
border-radius: 8px;
text-align: center;
line-height: 38px;
color: blue;
height: 100%;
float: left;
}
<br><br><br>
<div id='percent'>
<div id='inner'>
<div style='width: 63%;' id='bar'><b>63% Full (1354.3 GiB Free)</b></div>
</div>
</div>

I tested the code using the (desktop) chrome device emulator and it runs fine on all sorts of devices. This does, however, not emulate the chrome app for android or IOS, but the aspect ratio of the device does not influence if the nested <div> renders or not.
I hope this gives you some insight into your problem.
P.S. Did you check if your chrome version is up-to-date? It might run an outdated version of html/css

background-attachment: fixed on mobile

I'm trying to set a background image for an spn web app and I need the background to be fixed (that it won't be scrolled with the rest of the page).
this is the body css:
body {
background-color: rgb(51, 102, 102);
background-image: url('../images/background.png');
background-attachment: fixed;
background-position: center;
color: #eee;
}
Safari in IOS and Chrome on Android repeat the background instead of fixing it at one point.
I've seen on the internet it's been disabled on mobile but is there a solution?

background-repeat: no-repeat;
background-position: center center;

There are other options to doing this but this is the only one that actually worked for me; and i tried just about all of them.
You set the div just below the initial tag. Then apply the image to the html within the div. Give the div and id attribute as well (#background_wrap in this case).
...I tried this without applying the actual image link within the html and it never worked properly because you still have to use "background-image:" attribute when applying the image to the background within css. The trick to getting this to work on the mobile device is not using any background image settings. These values were specific for my project but it worked perfectly for my fixed background image to remain centered and responsive for mobile as well as larger computer viewports. Might have to tweak the values a bit for your specific project, but its worth a try! I hope this helps.
<body>
<div id="background_wrap"><img src="~/images/yourimage.png"/></div>
</body>
Then apply these settings in the CSS.
#background_wrap {
margin-left: auto;
margin-right: auto;
}
#background_wrap img {
z-index: -1;
position: fixed;
padding-top: 4.7em;
padding-left: 10%;
width: 90%;
}

how to get a scrollable div in Android

i added a div with a lot of data in it, and it works fine on a PC and on the Blackberry, but it doesn't work on Android: The data is retrieved with no problems but the div isn't scrollable.
Here is the HTML code:
<div id="scroll">
<div runat="server" ID="view"></div>
</div>
And the CSS:
#view
{
position: absolute;
top: 15%;
left: 0.9%;
width: 98.3%;
height: 75%;
font-family: Calibri;
font-size: 0.5em;
white-space: pre-wrap;
border: 1px solid black;
overflow: auto;
padding: 0.2em;
}
What is the problem?

If you're trying to do this on a native android application, you're going to have to implement a ScrollView:
http://developer.android.com/reference/android/widget/ScrollView.html

I found a creative work-around (that works on Android (2.3.5 Gingerbread) and Firefox browser for Android).
I didn't have the problem reported here on the first site I did but had issues on the second. After finding this answers here I remembered the old site worked so I checked what I did there. Copying over old to new site I was able to fix my problem...
This works on Android/Firefox browser but does not put a scroll bar indicator on screen (but touch-drag scrolls the content down the .
What WORKED for me is dual Tags... EMBED code to scroll in a second tag.
<div style="width: 100%; height: 100%; background-color:#fdc4f6; border: solid 1px #000;">
<div style="overflow:scroll; height:350px; text-align:left; padding: 1em 4em 0 4em;"> [Content will scroll if text overflows div on Android now]
then close DIV tags now the content in the second
may not be the prettiest code or method to use, but it got the job done for me (although I haven't tested in iOS devices).
For what it's worth...
-LB-
<div style="width: 100%; height: 100%; background-color:#fdc4f6; border: solid 1px #000;"><div style="overflow:scroll; height:350px; text-align:left; padding: 1em 4em 0 4em;"> [Content will scroll if text overflows div on Android now]</div></div>