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Front-end learning--css--pseudo-class of child elements

Source: Internet
Author: User
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    1. : First-child looks for the first child element of the parent element, sorted in all child elements;
    2. : Last-child looks for the last child element of the parent element, sorted in all child elements;
    3. : Nth-child the child elements of the specified position in the parent element, sorted in all child elements;
    4. : First-of-type looking for the first child element in a specified type
    5. : Last-of-type finds the last child element in a specified type
    6. : Nth-of-type to find the specified child element in the specified type

You can use even to find even-numbered child elements.

You can use odd to find odd sub-elements

Demo

<!DOCTYPE HTML><HTML>    <Head>        <MetaCharSet= "UTF-8">        <title></title>        <styletype= "Text/css">            /*: First-child looks for the first child element of the parent element, sorted in all child elements;*/P:first-child{Color:#ADFF2F;            }            /*: Last-child looks for the last child element of the parent element, sorted in all child elements;*/P:last-child{Color:#008000;            }            /*: Nth-child The child elements of the specified position in the parent element, sorted in all child elements;*/P:nth-child (3){Color:#FFFFFF;Background-color:#000000;            }            /*: First-of-type Looking for the first child element in a specified type*/H3:first-of-type{Color:Red;            }            /*: Last-of-type finds the last child element in a specified type*/H3:last-of-type{Color:Green;            }            /*: Nth-of-type to find the specified child element in the specified type*/H3:nth-last-of-type (2){Color:Yellow;            }                        /*you can use even to find even-numbered child elements that can use odd to find odd-numbered child elements*/H4:nth-last-of-type (even){Color:Red;            }H4:nth-last-of-type (Odd){Color:Green;            }        </style>    </Head>    <Body>        <P>Sometimes concerns are asked, and sometimes concerns are not asked.</P>        <H3>----I'm a split line 1----</H3>        <P>So undisturbed, hello and me.</P>        <H3>----I'm a split line 2----</H3>        <P>Mountain or mountain, water or water, life and work will be as usual.</P>        <H3>----I'm a split line 3----</H3>        <P>Hope that the change of ideas can stay longer: to the people of Heaven, believe in the heart</P>        <H3>----I'm a split line 4----</H3>        <BR/>        <BR/>        <BR/>                <h4>Water</h4>        <h4>Your eye area must be smaller than the lake.</h4>        <h4>And you seldom cry.</h4>        <h4>Why are you sitting in front of you?</h4>        <h4>It's like standing on the edge of a lake</h4>        <h4>The thin fog on the ground</h4>    </Body></HTML>

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Front-end learning--css--pseudo-class of child elements

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