I've been puzzled trying to figure out why my CSS was not applying when I had
mydiv .myclass { font-size: 24px !important; }
But then I randomly decided to try
mydiv.myclass { font-size: 24px !important; }
and surprisingly it worked perfectly.
What is the distinction between these two?
When the space is present: it refers to elements with the "myclass" class nested inside a div.
When the space is absent: it pertains to div elements with the "myclass" class.
/*Target div elements with the 'container' class*/
div.container{
height: 100px;
background-color: grey;
}
/*Select elements with the 'container' class inside a div*/
div .container{
height: 10px;
width: 10px;
background-color: red;
}
DEMONSTRATION: https://jsfiddle.net/gdxva1k0/
In this scenario, the initial space serves as a descendant combinator. To illustrate, p .center would indicate an element contained within a p tag with the class center;
Conversely, consider the case of p.center, where all p tags with the center class are encompassed.
This specific div.myclass selects all div elements that also have the class .myclass.
On the other hand, div .myclass targets any element with the class .myclass that is nested inside a div element at any level (known as a descendant selector).
In addition...
The selector div >.myclass specifically targets elements with the class .myclass that are direct children of a div element (referred to as a child selector).
Another type of selector is the adjacent sibling selector (div +.myclass) which allows you to choose an element that directly follows another specified element.
To wrap it up, there's also div ~.myclass which is a general sibling combinator selector; similar to the adjacent sibling combinator selector, but the selected element doesn't have to immediately follow the first element, it can appear anywhere after it.
When there is a space between elements, it signifies that the second element is a child of the first. Therefore,
div span
refers to any span that is a child of a div. It's important to note that a class cannot be a child in this context.
tag.class
Indicates that all elements of type tag with the class .class will receive the specified style rules.
The initial statement is as follows: Choose all elements with the class .myclass that are descendants of a mydiv element.
The alternative explanation is: Choose every mydiv element that has a class attribute of myclass
For more information on CSS selectors, check out this helpful resource here
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