CSS ID Selector with Example

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CSS Selector Definition

Selectors are one of the most important aspects of CSS as they are used to select elements on a web page so that they can be styled. You can define selectors in various ways.

A CSS selector is a pattern to match the elements in an HTML document. The associated style rules is applied to the elements that match the selector pattern.


CSS Id Slector:

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.

It is selected with the hash character (#),

Example:


Output:

	

Welcome to aimtocode.com

This paragraph will not be affected.



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List of different CSS Selectors


Selector Example Example description
class .intro Selects all elements with class="intro"
.class1.class2 <div class="name1 name2">...</div> Selects all elements with both name1 and name2 set within its class attribute
.class1 .class2 <div class="name1">
  <div class="name2">
    ...
  </div>
</div>
Selects all elements with name2 that is a descendant of an element with name1
#id #firstname Selects the element with id="firstname"
* * Selects all elements
element p Selects all <p> elements
element,element div, p Selects all <div> elements and all <p> elements
element element div p Selects all <p> elements inside <div> elements
element>element div > p Selects all <p> elements where the parent is a <div> element
element+element div + p Selects all <p> elements that are placed immediately after <div> elements
element1~element2 p ~ ul Selects every <ul> element that are preceded by a <p> element
[attribute] [target] Selects all elements with a target attribute
[attribute=value] [target=_blank] Selects all elements with target="_blank"
[attribute~=value] [title~=flower] Selects all elements with a title attribute containing the word "flower"
[attribute|=value] [lang|=en] Selects all elements with a lang attribute value starting with "en"
[attribute^=value] a[href^="https"] Selects every <a> element whose href attribute value begins with "https"
[attribute$=value] a[href$=".pdf"] Selects every <a> element whose href attribute value ends with ".pdf"
[attribute*=value] a[href*="w3schools"] Selects every <a> element whose href attribute value contains the substring "w3schools"
:active a:active Selects the active link
::after p::after Insert something after the content of each <p> element
::before p::before Insert something before the content of each <p> element
:checked input:checked Selects every checked <input> element
:default input:default Selects the default <input> element
:disabled input:disabled Selects every disabled <input> element
:empty p:empty Selects every <p> element that has no children (including text nodes)
:enabled input:enabled Selects every enabled <input> element
:first-child p:first-child Selects every <p> element that is the first child of its parent
::first-letter p::first-letter Selects the first letter of every <p> element
>::first-line p::first-line Selects the first line of every <p> element
:first-of-type p:first-of-type Selects every <p> element that is the first <p> element of its parent
:focus input:focus Selects the input element which has focus
:hover a:hover Selects links on mouse over
:in-range input:in-range Selects input elements with a value within a specified range
:indeterminate input:indeterminate Selects input elements that are in an indeterminate state
:invalid input:invalid Selects all input elements with an invalid value
:lang(language) p:lang(it) Selects every <p> element with a lang attribute equal to "it" (Italian)
:last-child p:last-child Selects every <p> element that is the last child of its parent
:last-of-type p:last-of-type Selects every <p> element that is the last <p> element of its parent
:link a:link Selects all unvisited links
:not(selector) :not(p) Selects every element that is not a <p> element
:nth-child(n) p:nth-child(2) Selects every <p> element that is the second child of its parent
:nth-last-child(n) p:nth-last-child(2) Selects every <p> element that is the second child of its parent, counting from the last child
:nth-last-of-type(n) p:nth-last-of-type(2) Selects every <p> element that is the second <p> element of its parent, counting from the last child
:nth-of-type(n) p:nth-of-type(2) Selects every <p> element that is the second <p> element of its parent
:only-of-type p:only-of-type Selects every <p> element that is the only <p> element of its parent
:only-child p:only-child Selects every <p> element that is the only child of its parent
:optional input:optional Selects input elements with no "required" attribute
:out-of-range input:out-of-range Selects input elements with a value outside a specified range
::placeholder input::placeholder Selects input elements with placeholder text
:read-only input:read-only Selects input elements with the "readonly" attribute specified
>:read-write input:read-write Selects input elements with the "readonly" attribute NOT specified
:required input:required Selects input elements with the "required" attribute specified
:root :root Selects the document's root element
::selection ::selection Selects the portion of an element that is selected by a user
:target #news:target Selects the current active #news element (clicked on a URL containing that anchor name)
:valid input:valid Selects all input elements with a valid value
:visited a:visited Selects all visited links
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