On every other browser the webpage looks fine except Firefox. Even Internet Explorer! The pseudo elements float all over the document or even aren't displayed after the first ones are. Is there any solution of this behaviour?
CSS
span[property="dc:date dc:created"]::before{
position: absolute;
top: 60px;
content: '';
display: block;
background-color: #005691;
width: 60px;
height: 20px;
}
span[property="dc:date dc:created"]::after{
position: absolute;
top: 60px;
right: 0;
width: 0px;
height: 0px;
border-top: 20px solid #01416F;
border-right: 20px solid rgba(0, 0, 0, 0);
content: '';
}
http://jsfiddle.net/LRnCM/1/
You needed to position the absolutely positioned pseudo elements relative to the parent element. Also, inline-block was added to contain the parent element's width.
.submitted {
position:relative;
display:inline-block;
}
UPDATED EXAMPLE
Related
As mentioned in the title, my css ::after pseudo element isn't working. My code goes like this, have I done something wrong?
span::after {
content: '';
height: 10px;
width: 10px;
border: none;
background-color: #0000ff;
border-radius: 50%;
position: relative;
top: -10px;
left: -10px;
}
You have to add display:block; for the pseudu element to work. Also try to change your position to absolute for top and left properties.
I am creating a simple horizontal navigation. Trouble I'm running into is when I am adding a css triangle to the "active" page using <after> pseudo element, the overall <li> height for that item is increasing, which throws the whole bar off.
I'm sure I'm just overlooking something, but I've tried troubleshooting it and the solution is eluding me. Any help would be very much appreciated!
Here is a codepen: http://codepen.io/joshmath/pen/HiBvd
the :after element takes up space when it is positioned relatively, so there are two things you can do.
1) set the height of the <li>:
nav ul {
li {
height: 1em; // 1em == the height of one line of text
overflow: visible; // not required, but good to have
}
}
2) position the pseudo element absolutely (I typically do this)
nav ul {
li.current {
position: relative;
&:after {
position: absolute;
top: 100%; // align the top of the pseudo element with the bottom of li.current
left: 50%; // center
margin-left: -6px; // half the width of the pseudo element to correct the center
// your styles:
content: '';
width: 0px;
height: 0px;
border-left: 6px solid transparent;
border-right: 6px solid transparent;
border-top: 6px solid #3ad2bc;
}
}
}
You just need to add a position relative to your menu item, then the after can be positioned absolute, then it won't affect your height.
Code Snippet below
nav ul li.current{
position:relative;
a{
color: #3ad2bc;
}
&:after{ //colored triangle
content: '';
width: 0px;
height: 0px;
border-left: 6px solid transparent;
border-right: 6px solid transparent;
border-top: 6px solid #3ad2bc;
margin-left: 0;
position:absolute;
bottom: -10px;
left:50%;
margin-left:-12px;
}
}
check this codePen
I adding a
position: relative;
text-align: center;
in li properties and position absolute in pseudo element added
In this jsfiddle, I'm trying to create a bookmark shape. There is only one triangle which needs to change its positioning.
<div id = "bookmark">
<div id = "rectangle"></div>
<div id = "triangle-topleft"></div>
<div id = "triangle-topright"></div>
</div>
I could easily use relative positioning and shift it, but I don't want to do it this way. I want a more malleable solution.
Instead of the shapes flowing from top to bottom. I want the last shape to flow left to right. So there are 3 shapes, the first two are in the perfect place, but the third one needs to be placed to the right of the second shape, instead of underneath it.
What CSS can I use to do this?
Add float:left; to #triangle-topleft and margin-left:100px; to #triangle-topright
#triangle-topleft {
position: static;
width: 0;
height: 0;
border-top: 100px solid black;
border-right: 100px solid transparent;
float:left;
}
#triangle-topright {
position: relative;
width: 0;
height: 0;
border-top: 100px solid black;
border-left: 100px solid transparent;
margin-left:100px;
}
jsFiddle example
First of all you do not have to declare position: static; as it is already static by default (Unless you are using responsive design where you need to reset the property value at certain point of resolution), secondly, assign position: relative; to your #bookmark and make the second triangle position: absolute;
Demo
#bookmark{
width: 200px;
position: relative;
}
#rectangle {
width: 200px;
height: 300px;
background: black;
}
#triangle-topleft {
width: 0;
height: 0;
border-top: 100px solid black;
border-right: 100px solid transparent;
}
#triangle-topright {
position: absolute;
right: 0;
width: 0;
height: 0;
border-top: 100px solid black;
border-left: 100px solid transparent;
bottom: 0;
}
Note: Make sure you do not make your first triangle position: absolute; else you need to reposition the triangles. But this is the best method you can get, as you've wrapped absolute inside a relative container.
You can also take a look at this awesome thing - Font Awesome - Bookmark, you can resize this to whatever size you want to.
The thing you are trying can be also achieved by using :before and :after pseudo along with content property. So you can get rid of the extra triangle elements.
As I said, you can create this thing with a single element.
#bookmark{
width: 200px;
position: relative;
height: 300px;
background: black;
}
#bookmark:before {
width: 0;
height: 0;
border-top: 100px solid black;
border-right: 100px solid transparent;
display: block;
content: "";
position: absolute;
bottom: -100px;
}
#bookmark:after {
position: absolute;
right: 0;
width: 0;
height: 0;
border-top: 100px solid black;
border-left: 100px solid transparent;
bottom: -100px;
display: block;
content: "";
}
Here, am using :before and :after pseudo, with display: block; and content: ""; which are essential to get this thing work, also am positioning both the elements using absolute with a value set to -100
Demo (Using single element)
Note: :before and :after pseudo can fail in older versions of IE,
but you can always use polyfills to use CSS 3 properties, also, for
more information on browser support, you can check this out.
You can just add float: left to #triangle-topleft and margin-left: 100px to #triangle-topright.
To remove unnecessary markup, you could also use :before and :after pseudo-elements instead of #triangle-*.
Add display:inline-block to both triangle shapes. They're stacking because they are defaulting to display:block.
It suffices to just add float:left to #triangle-topleft and #triangle-topright.
See the fiddle: http://jsfiddle.net/nfxYE/
Due to browser performance implications I can't use box-shadow CSS property because I have many similarly looking elements on my page that should have same looking style including shadow. That's the reason I would like to implement shadows using traditional PNG imagery.
Facts
My elements have predefined and more importantly fixed pixel width
They have fluid height (auto) depending on their content
They have content directly in the element and some child elements will be positioned outside their border
CSS3 can be used but performance-critical parts (gradients, shadows...) should be avoided
CSS pseudo elements can be used without limitation
Requirements
There should be no additional wrapper element added in order to have fluid shadow
Application should run smoothly on mobile browsers - shadows seem to slow down performance significantly on mobile devices since their processing power is much lower than desktop computers.
Possible direction
I thought of using :before and :after pseudos to display top-to-bottom and bottom shadows on the containing element, but these pseudos display within their parent element and positioning parent z-index higher than these children has no effect.
Visual demo of end result
This JSFiddle Demo in pure CSS3 that I would like to achieve but using PNG shadows. In reality there are numerous of these boxes so you can imagine mobile browsers are struggling with all these shadows.
Item is one such box (see blow) that needs PNG shadow. Left menu is child element positioned outside of the box.
Display in Chrome
HTML
<div class="item">
<menu>
<li>Yes</li>
<li>No</li>
<li>Maybe</li>
</menu>
<div class="content">
Some content
</div>
</div>
CSS3 LESS
.item {
position: relative;
width: 300px;
background-color: #fff;
box-shadow: 0 0 10px #ccc;
margin: 20px 20px 20px calc(20px + 3.5em);
min-height: 5em;
&:first-child {
margin-top: 0;
}
&:after {
content: "";
position: absolute;
top: 0;
left: 0;
width: 10px;
height: 5em;
background-color: #fff;
}
menu {
position: absolute;
top: 0;
left: -3.5em;
width: 3.5em;
margin: 0;
border: 0;
padding: 0;
list-style: none;
background-color: #fff;
box-shadow: 0 0 10px #ccc;
li a {
display: block;
text-align: center;
padding: 2px 0;
}
}
.content {
padding: .75em 1em;
}
}
Probably I am missing something, but looks like you want something in this way:
demo
The CSS is
.base {
width: 300px;
height: 150px;
font-size: 100px;
font-weight: bolder;
background-color: lightgreen;
position: relative;
z-index: auto;
}
.base:after {
content: '';
position: absolute;
top: 30px;
left: 30px;
background-color: green;
z-index: -1;
width: 100%;
height: 100%;
}
.child {
position: absolute;
left: 150px;
top: 50px;
border: solid 1px black;
color: red;
}
And just change the background of the :after to your image.
I have applied this solution to your fiddle.
The relevant CSS is for the before pseudo element:
.item:before {
content: "";
position: absolute;
top: -10px;
left: -10px;
right: -10px;
bottom: -10px;
z-index: -1;
background-image: url(http://placekitten.com/100/100);
background-repeat: no-repeat;
background-size: 100% 100%;
}
I have used a kitten picture, that is being scaled to cover all the needed size. Just change that to whatever you want.
I needed to do it that way because I had onky a pseudo element available.
The key for that to work (and where you probably had the difficulty) is to add z-index: auto to .item
Updated demo
Well, I had said that it wasn't posible, but I have find a way.
The standard technique would be to use 2 elements, just to avoid stretching the image (as you said). The problem is that we only have 1 pseudo element available.
The solution then would be to use 1 pseudo element, but with 2 backgrounds, to solve the issue.
CSS (only relevant part)
.item:before {
background-image: url(http://placekitten.com/320/10), url(http://placekitten.com/320/500);
background-repeat: no-repeat;
background-size: 100% 9px, 100% calc(100% - 9px);
background-position: left bottom, left top;
}
We will need an image (the first one) only 10 px in height, to cover the bottom shadow. And another one, with enough height to cover the maximumitem posible, and that will be used for the remaining part of the shadow. The dark part is that we need now a calc() height, with limited support. (anyway, better than border image)
demo 3
First time really using the pseudo :after selector. Not sure if the problem I'm running into is a limitation of it or I'm just missing something obvious.
Here's my live code.
li.current:after {
border-width: 1px 1px 0 0;
content: ' ';
background: #256f9e;
display: block;
height: 13px;
position: absolute;
width: 10px;
top: 6;
margin:0px auto;
z-index: 99;
transform: rotate(-224deg);
-webkit-transform: rotate(-224deg);
-moz-transform: rotate(-224deg);
-ms-transform: rotate(-224deg);
-o-transform: rotate(-224deg);
transform-origin: 50% 50%;
-webkit-transform-origin: 50% 50%;
-moz-transform-origin: 50% 50%;
-ms-transform-origin: 50% 50%;
-o-transform-origin: 50% 50%;
text-align: center;
float: center;
}
I've created a little triangle (Or rather a box that has been rotated to look like a triangle). I want it centered within the <li></li> but can't figure it out using my normal methods.
The things that have failed (in no particular order):
text-align: center;
float: center;
margin: 0 auto;
margin-right: 0;
margin-left: 0;
What am I missing? I doubt it matters, but I'm using AngularJS. Thought I'd mention it in case there is a known conflict between Angular & Pseudo selectors (which I doubt).
Thanks.
The issue is your use of absolute positioning & the method you're using to try and center it. If you position an element absolutely, the ol' margin: 0 auto; method won't work to center the thing. I point you to an explanation as to why this is at the end of the question, but in case you just want this to work let's get to the solution first.
Here's some working code. View it on JSFiddle
#tool-menu li {
...
position: relative;
}
li.current:after {
...
position: absolute;
width: 10px;
top: 6;
left: 50%;
margin-left: -5px;
}
Let's break down what's going on here.
Setting up a new Containing Block
In your original Fiddle, the pseudoelement is positioned absolutely relative to the viewport. An example might be the best way to show what this means, and why we don't want this. Consider setting it to top: 0. This would keep it latched to the top of the browser window (or, in this case, the JSFiddle frame), rather than the parent (the li). So, if our menu happened to be at the bottom of the page, or even moving around, the pseudoelement would be floating independent from it, stuck to the top of the page.
This is the default behavior of an absolutely positioned element when you don't explicitly set the position on any parent elements. What we want is to have its position defined relative to the parent. If we do this then the pseudoelement sticks with the parent, no matter where it happens to be.
To make this happen, you need to set the parent, #tool-menu li, to be explicitly positioned (which means setting it to be anything other than position: static). If you choose to use position: relative;, it won't change the computed location of the parent on the page, and does the thing we want. So that's why I used that one.
In technical terms, what we're doing here is creating a new containing block for the child.
Positioning the Pseudoelement
Now that our absolute positioning will be determined in relation to the parent, we can take advantage of the fact that we can use percentages to define where to place the child. In this case, you want it centered, so I set it be left: 50%.
If you do just this, though, you'll see that this lines up the left edge of the pseudoelement at 50%. This isn't what we want – we want the center of the pseudoelement to be at the middle. And that's why I added the negative margin-left. This scoots it over a bit to line the middle up with the center of the parent.
And once we do that, it's centered! Brilliance!
Why didn't my margin: auto; work?
The auto value of a margin is calculated from a fairly complex algorithm. At times, it computes to 0. I know from experience that this is one such instance of that happening, though I haven't yet traced my way through the algorithm to see exactly why. If you'd like to run through it, take a look at the spec most browsers have most likely implemented.
Using calc to center
You can also use the calc function in css to center the pseudo element.
Note: This isn't supported in IE8 and below (caniuse) but you can provide a fallback for older browsers.
View it on this code pen. I'm also using MarkP's css border method to draw the triangle.
li.current:after {
content: '';
display: block;
height: 0;
position: absolute;
width: 0;
overflow: hidden;
bottom: -5px;
left: calc(50% - 5px);
z-index: 2;
border-top: 5px #256f9e solid;
border-left: 5px transparent solid;
border-right: 5px transparent solid;
}
Wouldn't be better to just define the width as a percentage, make it a block element and text-align it in the center?
"float: center;" is invalid, and won't work. Mixing floated and absolute positioned elements are a sure way to get trouble with your layout as they don't really work that well togheter.
Try something like this:
li.current:after {
content: 'YOUR CONTENT';
display: block;
width: 100%;
text-align: center; }
Using margin:auto to center
As long as the element has a width declared you can use the absolute centering method.
To use this method the right and left properties must be set to 0 for margin: auto to be effective.
This method can be expanded to implement horizontal centering as well.
see link for full info:
http://www.smashingmagazine.com/2013/08/09/absolute-horizontal-vertical-centering-css/
li.current:after {
content: "";
position: absolute;
display: block;
right: 0;
bottom: -5px;
left: 0;
margin: auto;
border-width: 5px;
border-style: solid;
border-color: transparent;
border-top-color: #256f9e;
width: 200px;
height: 200px;
}
ul {
list-style-type: none;
padding: 0;
margin: 0;
}
<div>
<ul>
<li class="current"></li>
</ul>
</div>
Not directly related (have already voted up jmeas) but you may also find it easier to use the CSS border trick to make the triangle. e.g.
li.current:after {
content: '';
display: block;
height: 0;
position: absolute;
width: 0;
overflow:hidden;
bottom: 0;
left: 50%;
margin: 0 0 -5px -5px;
z-index: 99;
border-top: 5px #256f9e solid;
border-left: 5px transparent solid;
border-right: 5px transparent solid;
}
Similar tactics as to what jmeas has suggested with regards to the vertical positioning. We align to the bottom and then use a negative margin-bottom to push this out to the desired location.
With transform: translate() centering can be accomplished without a fixed size. This is because translate(<x>%) will use the (psuedo-)element's own size, while left and margin-left will use the container's size. By using these together we can therefore find the exact center-point.
tl;dr
To center vertically:
.container {
position: relative;
}
.container:after {
top: 50%;
transform: translateY(-50%);
}
To center horizontally:
.container {
position: relative;
}
.container:after {
left: 50%;
transform: translateX(-50%);
}
Full example
.container {
position: relative;
display: inline-block;
background: #4aa;
color: white;
padding: .5ex 1ex;
}
.container:after {
content: ":after";
position: absolute;
background: #a4a;
color: white;
padding: .5ex 1ex;
/* position below container */
top: 100%;
/* move right by 50% of containers width */
left: 50%;
/* move left by 50% of own width */
transform: translateX(-50%);
}
<p class="container">
Container with content
</p>
This may be the simplest way to do it:
.child_class::after{
position: absolute;
content: 'YourContentHere';
width: 100%;
text-align: center;
top: 50%;
}
the simplest way to do this -
With pesudo element :after or :before use display: inline-block;
Try something like this:
content: url(../images/no-result.png);
display: inline-block;
width: 100%;
text-align: center;
Using display: grid to center ::before
...worked nice for me. I'm using fa-Icons on this page and centered them within an element with 50% border-radius:
i {
font-size: 0.9rem;
border: 1px solid white;
border-radius: 50%;
width: 30px;
aspect-ratio: 1;
margin-inline: 5px;
}
i::before {
width: 100%;
height: 100%;
display: grid;
place-items: center;
}
This tutorial can help you to make center CSS pseudo-elements.
https://techidem.com/centering-pseudo-before-after-elements-content/
h2 {
text-align: center;
color: #181818;
padding-bottom: 20px;
margin-bottom: 35px;
border-bottom: 1px solid #eaeaea;
position: relative;
}
h2::after {
content: "";
width: 70px;
height: 4px;
background-color: #ff0000;
left: calc( 100% - ( 50% + 35px ) );
position: absolute;
display: block;
bottom: 0;
}
<h2>Most Recent Posts</h2>
You may use container queries with grid layout
element {
container-type: size;
&::after {
content: '';
position: absolute;
width: 100cqw;
height: 100cqh;
display: grid;
place-items: center;
}
}
Container queries: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Container_Queries
I personally don't really like the idea to change position attribute or do some margin manipulation. I think the easiest way is two lines of CSS:
.element::after {
/* your css */
line-height: initial;
vertical-align: initial;
}
And there is no need to touch the parent.