Css html id selector
CSS selectors are used to select the content you want to style. Selectors are the part of CSS rule set. The id selector selects the id attribute of an HTML element to select a specific element. An id is always unique within the page so it is chosen to select a single, unique element.
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CSS Selector
Earlier we show that element selectors can be used to define the element at which we want to apply our styles.
However, there are additional selectors. The id is one of them. The name can be anything but it cannot start with a digit or a dash. The id selector selects elements with a specific id attribute name.
Thus in our CSS the id will be:. The basic rule is that id is unique. This means that one id will only exists once in the HTML page and that each element can contain only one id. Since ids are unique, we only use them if we want to apply a specific style in an element to distinguish it from its surroundings elements. Assume that we want one of these paragraphs to displayed in italics. This can be achieved by applying an id to the specific paragraph. Thus in our CSS we will have:. However, if we want more than one paragraph to displayed in italics, then id should not be used.
That being said, if you try to use id for this propose you will indeed have the desired result. However, your code will not be functional for JavaScript, as we will see later in the course.
There is an alternative selector that is appropriate for this case which is explained in the next section.
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CSS selectors
Once you understand how selectors work you should find it easy to get up to speed with any of the complex CSS selectors that have great support in browsers at this point. Element, class and ID selectors. The most basic of the selectors is an element selector. To select all paragraphs in a document we would use the following selector.
Using selectors
They look nearly identical, but the top one has no space between header and. This small difference makes a huge difference in what it does. Select all elements with the class name callout that are decendents of the element with an ID of header. The big point here is that you can target elements that have combinations of classes and IDs by stringing those selectors together without spaces. Target an element that has all of multiple classes. Shown below with two classes, but not limited to two. So how useful is all this really? I admit the use cases for the ID versions are slimmer, but there are certainly uses. One of those is overriding styles easily. Then some of them have color names as classes, this would be for controlling the colors used inside the box.
How to use CSS Selectors
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CSS ID Selector Example
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Multiple Class / ID and Class Selectors
Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search. If the answer to 1 is YES, what's the need for the div selector before the someid, shouldn't the id be unique in a valid web page? The answer is they are the same but using the div in front of id is superfluous and removing it does no harm while leaving it in only takes up space. Some may feel it makes the markup more readable, however, since it identifies the type of element the id is associated with. I did read, once, that placing the div in front of the id may cause the browser to search through all divs first while just using id does not but I'd have to look up that reference. From what I understand, CSS will rank selectors based on how specific the selector is, if two rules apply to the same element,. Then which wins?
How to Use CSS Selectors to Style Your Web Page
We started the Selector-part of this tutorial with the most wide-ranging selector, which targets elements, then we talked about the more specific class-type selector, and now we'll be discussing the most specific selector type: The ID selector. The ID selector is actually so specific that it only targets a single element on the page! Just as we saw with the class selector, the ID selector uses a specific attribute found on all HTML tags to figure out whether the specific rule applies to the element or not, and that's the ID attribute.
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RELATED VIDEO: CSS Dasar - 7 - SelectorThe way CSS bobs and weaves through your document to style the right elements is both fascinating as well as useful for you to understand if you want to create great looking applications and web sites. In this tutorial, you will learn how common CSS selectors work to map a particular rule to elements in your document. We will start off by deconstructing and understanding very simple examples and then moving to more complicated examples that you will encounter If any of the CSS terminology such as selectors and rules is unfamiliar to you, check out the Anatomy of a CSS Style article for a quick introduction. Let's first start by looking at a simple style rule whose selector applies to all p tags:. With what we have here, if any p tags are encountered in our HTML document, this rule will get applied.
Written by Anna Fitzgerald. How you define them will affect how you customize them using CSS selectors. For example, if you want to make broad changes on your site, then you can use a type selector. To make more detailed changes, you need a more specific selector. The most specific is an ID selector.
The following is a list of the most common and well-supported CSS selectors. There are many, many more, but these are the ones you should know well. That's a fancy name for simply using an HTML tag, without the angle braces. For example, if we wanted to make all paragraphs have green text, we would use the following CSS rule:.
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