In the example bellow:
http://jsfiddle.net/Du8f6/3/
Im setting inner shadow to the container and 10px border with border-radius set to 50%.
And the result is weired thin white border outside the container border.
The thin white border is visible in:
mozilla firefox
ie 11
and its not visible in:
opera
safari
chrome
any suggestions for fixing this are welcome.
It's because the way the border is rendered: painted over the div. It's another "half pixel" issue and the border color mixs with the div background color... Take a look to Border-radius: 50% not producing perfect circles in Chrome or IE11 draws small line between positioned elements . Those are not the same issue, but have the same origin.
Probably your easier workaround is to skip out the border width of the div and set up a "fake" border using the background of a new wrapper div:
In your html:
<div class="fakeborder"><div class="sub">Hm</div></div>
and in your css:
.sub {
...
border: 0px solid black;
...
}
.fakeborder{
margin:0;
padding:10px; /*The fake border width*/
background:black; /*The fake border color*/
}
I had a similar issue.
Even if I set
box-shadow:0 0 0 rgba(0,0,0,0);
to the element just because I didn't want a box-shadow for that element and I thought I could override the property like this.
That was working in webkit browsers, but FF was still rendering a thin shadow.
A better solution and the best practice to override a css property to its default, it is obviously set it to its default (dumb!)
box-shadow: none
I constructed a thought bubble with HTML and CSS and found an issue solely on IE11 - every other browser (down to IE9) works great.
The idea is simple:
Have a container that contains text and give it a background-color and round corners. Then put another element into it and make it look like an arrow. Position the arrow so that it sits right next to the container.
The problem:
Somehow, even though the arrow sits perfectly adjusted, there is a very small line between arrow and container. And this line is less then 1px in height. If I move the arrow up a notch then it sits inside the container which cannot be accepted due to the fact that arrow and container must have transparency.
Here is the jsfiddle showing the problem:
http://jsfiddle.net/hurrtz/t2RhR/3/
HTML really is simple.
<div id="bubble">
<div class="arrow"></div>
</div>
CSS is equally simple and boils down to this (some pseudo code ahead):
#bubble {
(some dimension giving)
background-color: rgba(0,0,0,0.5); //black, semitransparent
position: relative;
}
#bubble .arrow {
position: absolute;
bottom: 0 - height of arrow:
background-color: rgba(0,0,0,0.5); //black, semitransparent
}
By the way: The problem increases, decreases or seizes to exist the more I let IE11 zoom in or if the browser window's height is changed.
Here's what it looks like with the gap in IE11:
A screenshot of this picture, zoomed at 500% shows this:
It's because the way the border is calculated. Screen is a finite grid, so when you decide that the center of the arc is at coordinates e.g. "10 x, 10 y" it could mean different things:
the center of the arc is in the middle of the 10th pixel?
the center of the arc is at the begginnig of the 10th pixel?
the center of the arc is at the end of the 10th pixel?
So, when it draws the arc with radius 10px it could go half pixel farther (or closer) from the point you expected (and will yield "half pixel" sizes, a 2px gray line where you wanted 1px black, a circle that is not really round or some other sad surprise).
This kind of different behaviour is common among the major browsers (e.g. see this: Border-radius: 50% not producing perfect circles in Chrome ) I think it shouldn't be considered a bug, those are just implementation decisions that unluckily for us differ from a browser to another.
The most common solutions is to play with the border width (0.5px,1px,2px) and radius (even/odd sizes) or even positioning with decimals (bottom: -19.5px?). Can't say wich combination will yield best results for this case since I can't reproduce it in Windows 7 + IE11.
border-bottom: 1px transparent solid ;
margin-bottom: -1px ; /* grey line fix */
all well and good but there is no real answer to the problem here. after a search i found this. and it worked on the IE and safari grey line issue on a simple white box i use.
Based on #miguel-svq answer (thanks!!!), which was very helpful, I have simplified it with the following:
#bubble{
/* Set the border color to match your surrounding background.
It will take away the grey line in IE11 */
border: solid 0.5px #f0f0f0;
}
I'm coming across an issue that I feel like I've found (and solved) before. But can't remember what or how.
I'm using jQuery Mobile and re-skinning it majorly. Part of this is putting a solid thick line at the bottom of the nav items. So I've overridden the borders so I have a left and right 1px border, then a 10px bottom border. But the bottom border is jagged, it looks like the left and right are trying to come over half of the bottom border but not all of it.
I've attached a screenshot of the problem (I've increased bottom-border to 25px to make it more obvious).
#id
{
border: #231F20 1px solid;
border-top: none;
border-bottom: #EE1E5C 25px solid;
}
Any ideas where this problem is coming form and how to solve?
It's because the border edges don't meet in straight horizontal or vertical lines, but in diagonals starting at the corner of the inner box and finishing at the corner of the box including the borders (in this case that means the border finishes one pixel to the left and right of where it starts). If you changed your side borders to be wider it'd be clearer what's happening.
Here's a quick image to illustrate:
The borders join along the red lines.
As to a solution - you may need an extra element to wrap to provide that bottom border, or get rid of your 1px side borders. Neither are ideal solutions I'm afraid.
I'm using a 15px rounded border on a div, and the border itself is rounded on the outside but on the inside (where border meets background) it's still a square corner.
Example: http://jsfiddle.net/BQT5F/1/
I thought background-clip would help out here but it doesn't. This should be possible, right?
(Also, I know it's not IE compatible, I'm just aiming for chrome and FF for the moment)
To get a rounded inner border, the border radius must be greater than the border thickness. For example:
border-radius: 30px;
border-width: 15px;
What is the difference between border and outline properties in CSS?
If there is no difference, then why are there two properties for the same thing?
From: http://webdesign.about.com/od/advancedcss/a/outline_style.htm
The CSS outline property is a confusing property. When you first learn about it, it's hard to understand how it is even remotely different from the border property. The W3C explains it as having the following differences:
Outlines do not take up space.
Outlines may be non-rectangular.
In addition to some other answers... here are a few more differences I can think of:
1) Rounded corners
border supports rounded corners with the border-radius property. outline doesn't.
div {
width: 150px;
height: 150px;
margin: 20px;
display: inline-block;
position: relative;
}
.border {
border-radius: 75px;
border: 2px solid green;
}
.outline {
outline: 2px solid red;
border-radius: 75px;
-moz-outline-radius: 75px;
outline-radius: 75px;
}
.border:after {
content: "border supports rounded corners";
position: absolute;
bottom: 0;
transform: translateY(100%);
}
.outline:after {
content: "outline doesn't support rounded corners";
position: absolute;
bottom: 0;
transform: translateY(100%);
}
<div class="border"></div>
<div class="outline"></div>
FIDDLE
(NB: Although firefox has the -moz-outline-radius property which allows rounded corners on outline... this property it is not defined in any CSS standard, and is not supported by other browsers (source))
2) Styling one side only
border has properties to style each side with border-top:, border-left: etc.
outline can't do this. There's no outline-top: etc. It's all or nothing. (see this SO post)
3) offset
outline supports offset with the property outline-offset. border doesn't.
.outline {
margin: 100px;
width: 150px;
height: 150px;
outline-offset: 20px;
outline: 2px solid red;
border: 2px solid green;
background: pink;
}
<div class="outline"></div>
FIDDLE
Note: All major browsers support outline-offset except Internet Explorer
Further to other answers, outlines are usually used for debugging. Opera has some nice user CSS styles that use the outline property to show you where all the elements are in a document.
If you're trying to find out why an element isn't appearing where you expected or at the size you expected, add a few outlines and see where the elements are.
As already mentioned, outlines do not take up space. When you add a border, the element's total width/height in the document increases, but that doesn't happen with outline. Also you can't set outlines on specific sides like borders; it's all or nothing.
tldr;
The W3C explains it as having the following differences:
Outlines do not take up space.
Outlines may be non-rectangular.
Source
Outline should be used for accessibility
It should also be noted that outline's primary purpose is accessibility. Setting it to outline: none should be avoided.
If you must remove it it maybe a better idea to provide alternative styling:
I’ve seen quite a few tips on how to remove the focus indicator by using outline:none or outline:0. Please do not do this, unless you replace the outline with something else that makes it easy to see which element has keyboard focus. Removing the visual indicator of keyboard focus will give people who rely on keyboard navigation a really hard time navigating and using your site.
Source: "Do Not Remove the Outline from Link and Form Controls", 365 Berea Street
More Resources
http://outlinenone.com/
A practical use of outline deals with transparency. If you have a parent element with a background, but want a child element's border to be transparent so that the parent's background will show through, you must use "outline" rather than "border." While a border can be transparent, it will show the child's background, not the parent's.
In other words, this setting created the following effect:
outline: 7px solid rgba(255, 255, 255, 0.2);
From W3 School Site
The CSS border properties allow you to specify the style and color of an element's border.
An outline is a line that is drawn around elements (outside the borders) to make the element "stand out".
The outline shorthand property sets all the outline properties in one declaration.
The properties that can be set, are (in order): outline-color, outline-style, outline-width.
If one of the values above are missing, e.g. "outline:solid #ff0000;", the default value for the missing property will be inserted, if any.
Check here for more information :
http://webdesign.about.com/od/advancedcss/a/outline_style.htm
Border is created inside the element, where as outline is created outside the element. So border is computed along with the width and height of the element, while outline draws outside the element.
A little bit of an old question, but worth mentioning a Firefox rendering bug (still present as of Jan '13) where the outline will render on the outside of all child elements even if they overflow their parent (through negative margins, box-shadows, etc.)
You can fix this with:
.container {
position: relative;
}
.container:before {
content: '';
margin: 0;
padding: 0;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
outline: 1px solid #ff0000;
}
Super unfortunate that it's still not fixed. I much prefer outlines in many cases since they do not add to the dimensions of an element, saving you from always having to consider border widths when setting dimensions of an element.
After all, which is simpler?
.container {
width: 960px;
height: 300px;
outline: 3px solid black;
}
Or:
.container {
width: 954px;
height: 294px;
border: 3px solid black;
}
It is also worth noting, that W3C's outline is IE's border, since IE does not implement W3C box model.
In w3c box model, the border is exclusive of element's width and height. In IE it is inclusive.
Differences between border and outline:
Border is part of the box model so it counts against the element's size.
Outline is not part of the box model so it doesn't affect nearby elements.
Demo:
#border {
border: 10px solid black;
}
#outline {
outline: 10px solid black;
}
<html>
<body>
<span id="border">Border</span>Other text<br><br>
<span id="outline">Outline</span>Other text
</body>
</html>
Other differences:
The outline is displayed outside the border.
Outlines cannot have rounded corners; borders can.
I've made a little piece of css/html code just to see the difference between both.
outline is better to inclose potential overflowing child elements, especially into an inline container.
border is much more adapted for block-behaving elements.
Fiddle for you sir!
The outline property in CSS draws a line around the outside of an element. It's similar to border except that:
It always goes around all the sides, you can't specify particular
sides It's not a part of the box model, so it won't effect the
position of the element or adjacent elements
Source: https://css-tricks.com/almanac/properties/o/outline/
As a practical example of using "outline", the faint dotted border that follows the system focus on a webpage (eg. if you tab through the the links) can be controlled using the outline property (at least, I know it can in Firefox, not tried other browsers).
A common "image replacement" technique is to use, for example:
<div id="logo">Foo Widgets Ltd.</div>
with the following in the CSS:
#logo
{
background: url(/images/logo.png) center center no-repeat;
}
#logo a
{
display: block;
text-indent: -1000em;
}
The problem being that when the focus reaches the tag, the outline heads off 1000em to the left. Outline can allow you to turn off the focus outline on such elements.
I believe that the IE Developer Toolbar is also using something like outline "under the hood" when highlighting elements for inspection in "select" mode. That shows well the fact that "outline" takes up no space.
think about outline as a border that a projector draw outside something as a border is an actual object around that thing.
a projection can easily overlap but border don't let you pass.
some times when i use grid+%width, border will change the scaling on view port,for example a div with width:100% in a parent with width:100px fills the parent completely, but when i add border:solid 5px to div it make the div smaller to make space for border(although it's rare and work-aroundable!) but with outline it doesn't have this problem as outline is more virtual :D it's just a line outside the element
but the problem is if you don't do spacing properly it would overlap with other contents.
to make it short:
outline pros:
it doesn't mess with spacing and positions
cons:
high chance of overlapping
Google web.dev has a good explaintion for Box Model.
The border box surrounds the padding box and its space is occupied by the border value. The border box is the bounds of your box and the border edge is the limit of what you can visually see. The border property is used to visually frame an element.
The margin box, is the space around your box, defined by the margin rule on your box. Properties such as outline and box-shadow occupy this space too because they are painted on top, so they don't affect the size of our box. You could have an outline-width of 200px on our box and everything inside and including the border box would be exactly the same size.
Copied from W3Schools:
Definition and Usage
An outline is a line that is drawn
around elements (outside the borders)
to make the element "stand out".