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Editorial Team
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Asked: 2026-06-17T12:57:06+00:00

<!DOCTYPE HTML> <script src=’http://code.jquery.com/jquery-latest.min.js’></script> <body> <div id=’mydiv’>Hello, buddy.</div> <div id=’mydiv’>Hello, friend.</div> </body> When in

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<!DOCTYPE HTML>

<script src='http://code.jquery.com/jquery-latest.min.js'></script>

<body>

<div id='mydiv'>Hello, buddy.</div>
<div id='mydiv'>Hello, friend.</div>

</body>

When in JQuery, if I $('#mydiv') it will select only the first div, BUT if I do $('div#mydiv') it will select all of them.

I understand that specifying the element as well as the id, it will prevent from selecting other elements that have the same id but are not divs.

Isn’t this a bug? Shouldn’t $('#mydiv') select all elements which id is ‘mydiv’?

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1 Answer

  1. Editorial Team

    Explanation for jQuery

    Also, in your case, jQuery should select only one element, and the first element for ID. Since you have also given div, it uses getElementsByTagName, and matches the attribute with ID. So, it returns all the instances. Please correct me if I am wrong.

    Suggestion

    According to web standards, the id attribute must be unique. So, each element should have unique ID. If you want to use things for multiple elements, you have classes.

    Also, your HTML won’t validate, if you have multiple IDs.

    Also, from the XHTML 1.0 Spec

    In XML, fragment identifiers are of
    type ID, and there can only be a
    single attribute of type ID per
    element. Therefore, in XHTML 1.0 the
    id attribute is defined to be of type
    ID. In order to ensure that XHTML 1.0
    documents are well-structured XML
    documents, XHTML 1.0 documents MUST
    use the id attribute when defining
    fragment identifiers on the elements
    listed above. See the HTML
    Compatibility Guidelines for
    information on ensuring such anchors
    are backward compatible when serving
    XHTML documents as media type
    text/html.

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