Code:
#navigation > ul > li > a
Descendant and child.
Is "a" child of li, or the holde code.
Or is "a" child li but descendant to the rest. I'm not quite into the rules. Hope you can help me out. :)
You read the selector one by one. Whether you read from left to right or right to left is up to you, but selectors are basically linear.
This selector means:
Select any a element
that is a child of a li element (li > a)
that is a child of ul element (ul > li)
that is a child of an element with the ID navigation (#navigation > ul).
Every element that is a child of its parent is also a descendant of its parent as well as that parent's parents. To put it in simpler terms: an element that's contained within another element is that element's descendant. Note that it's also a child only when it's directly contained within that element (and not something else nested in between) — people often refer to this as a "direct child" for emphasis, but a child is by definition directly contained in its parent anyway.
Thus, the structure of this selector implies the following:
a is a descendant of #navigation, ul and li but only a child of li
li is a descendant of #navigation and ul, but only a child of ul
ul is both a descendant and a child of #navigation
Additional reading:
Descendant selector and child selector from the spec
What does the ">" (greater-than sign) CSS selector mean? (with an illustration)
Related
Can someone please translate the following CSS to plain English for me.
#menu ul li:first-child > a:after
#menu ul li:first-child > a:after
Select :after pseudo element inside a element, the a element should be the direct child of li and the li should be the first child of any ul inside any element which have #menu id
Apply the defined styles to the :after pseudo element of all a elements that are children of the first li element inside of all ul elements that are inside an element with id menu.
Or
Selects any content placed after an a element that is a child of a li
element that is a first child that is a descendant of an ul element
that is a descendant of any element with an id attribute that equals
menu.
via SelectOracle
#menu ul li:first-child > a:after
means:
Target the :after pseudo-element (technically, ::after)...
which is associated with an anchor element (a)...
that is a child of a list item (li)...
which is first on the list among siblings (:first-child).
The li must be a descendant (but not necessarily a child) of an unordered list (ul)...
which itself is a descendant of an element with the id value of menu.
I'm currently reading Charles Wyke-Smith's book "Stylin' With CSS".
He has one section where there is nav.menu > ul {} AS WELL AS nav.menu ul {}.
What's the purpose of the > selector?
http://www.w3.org/TR/CSS2/selector.html
Quick Explanation:
E > F Matches any F element that is a child of an element E.
More detail from the same source:
A child selector matches when an element is the child of some element.
A child selector is made up of two or more selectors separated by ">".
The following rule sets the style of all P elements that are children
of BODY:
body > P { line-height: 1.3 } The following example combines
descendant selectors and child selectors:
div ol>li p It matches a P element that is a descendant of an LI; the
LI element must be the child of an OL element; the OL element must be
a descendant of a DIV. Notice that the optional white space around the
">" combinator has been left out.
For information on selecting the first child of an element, please see
the section on the :first-child pseudo-class below.
It selects immediate children, as opposed to descendants at any point in the hierarchy.
I'm not sure if my question title accurately displays what I'm trying to ask, but this is pretty much my first exposure to CSS3 and have been exploring various projects people have done in order to gain some hands on experience.
In searching through these projects I cam across something I'm having some trouble understanding. What exactly is the difference between the following two lines:
#random_ID > ul > li > a { ... }
#random_ID ul li a { ... }
Are these just two ways of writing the same thing? Any help would be greatly appreciated!
The greater than symbol limits the lookup to just first-level descendants: children of the selector on the left. Without the symbol, it can be any descendent at any level.
So the first example, it's "random_ID with a child ul with a child li with a child a" and the second is "random_ID with any descendant ul with any descendent li with any descendent a"
> means "direct child". This will only style it if the element (one on the right of >) is a direct child of the parent (one on the left of >)
So say if I have the following layout:
<div>
<ul>
<li></li>
<li></li>
</ul>
</div>
div > li { background: red; } Would not work, because li is not a direct child of it, whereas div > ul > li> or div li would work.
It should be noted that not every browser supports the direct child tag, specifically older versions of internet explorer, so don't rely on it, or have some fallback if you do use it.
I want to check if the current li has a ul, if so apply style to the li. is there a way to do this in css?
Using jQuery to do it is simple. $('li').has('ul').css('background-color', 'red');
CSS Tricks discusses what you want here - it's called parent selector, and it's not a great idea to implement. Generally I'll use jQuery to apply styles to a parent if the child exists.
are you wanting to know if an element (li) has a certain child element (ul), and if so, style the parent element (li)?
if so -- no, there is no way to style a parent based on it's children in pure css. However, jQuery has selectors that allow you to get nodes that match this pattern, which you can then apply styles to.
The following applies styles to the child uls of a li:
li ul li { color:red }
http://jsfiddle.net/bkC36/
To check if a clicked li has a ul inside of it you need JavaScript
This rule should apply a style to any li that has a ul at any level bellow it.
ul li {/* */}
If you want to style a li that has a ul directly bellow it you can use this rule
ul > li {/* */}
div li:first-child
what does above css selector target?
First li's of every div on the page
or
All the descendant li's of the div where div is the first child of its parent
The first-child applies to the li. It should select lis that are first children under any div.
The first LI inside a DIV. Example.
1) First li's of every div on the page