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CSS selectors

    Simple Selectors

    • type selectors
    • universal selector (*)
    • attribute presence and value selectors
    • attribute substring selectors
    • class selectors
    • two classes (.c1.c2)
    • id selectors

    Pseudo-classes

    • :link
    • :visited
    • :hover
    • :active
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    • :enabled and :disabled
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    • :nth-child
    • :nth-of-type
    • :nth-child vs :nth-of-type
    • :nth-last-child
    • :nth-last-of-type
    • :first-child
    • :first-of-type
    • :last-child
    • :last-of-type
    • :only-child
    • :only-of-type
    • :empty
    • :not

    Pseudo-elements

    • ::first-line
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    • ::before and ::after
    • ::placeholder

    Combinators

    • child vs descendant selector
    • adjacent sibling selector (E1 + E2)
    • general sibling selector (E1 ~ E2)

    Specificity

    • Selector specificity
     
    • Home
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    CSS id selectors – define style by element id

    on Apr 8, 2016

    The CSS id selector matches element having a specific id attribute This can be used to specify CSS style based on element id. Note that id should be unique and no two elements should have same id.

    Here is the syntax for defining style using id selector.

    #id1 { style properties } /*element having id id1*/
    
    div#id1 { style properties } /*div element having id id1*/
    

    Example – style using id selector

    <style>
    /* div#id1 can also be used to be more specific */
    #id1 {
      width: 100px; height:100px;
      background-color: lightgreen;
    }
    </style>
    
    <div id="id1">
      Hello world
    </div>
    refresh done
    try it online

    Related

    • CSS type selectors - define style by element name
    • CSS universal selector
    • CSS attribute presence and value selectors
    • CSS attribute substring selectors
    • CSS class selectors - define style by class name
    • CSS - style for element having two classes (both)

    Specification

    • W3C CSS 3 id selectors specification

    Suggested posts:

    1. CSS type selectors – define style by element name
    2. CSS class selectors – define style by class name
    3. CSS :only-child – define style if element if only child
    4. CSS attribute presence and value selectors
    5. CSS border – define border properties of an element
    6. CSS :empty – define style for empty element
    7. CSS attribute substring selectors
    8. CSS selector specificity
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    Posted in Tutorials | Tagged CSS, CSS selectors, Tutorials

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