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defined

Description
Syntax
Examples
Links

Description

The defined pseudo-class for CSS specifies elements that are fully defined.

Syntax

selector:defined
{
    property: value;
}

Examples

1 · CSS

2 · JS

<!doctype html>
<html>
<head>
    <style>
        :defined
        {
            color: var(--myvar1);
        }
        :not(:defined)
        {
            color: var(--myvar2);
        }
    </style>
</head>
<body>
    <button>initial</button>
    <button value="blue red">value</button><br>
    <span>standard element</span><br>
    <my-custom-element-defined>custom element defined</my-custom-element-defined><br>
    <my-custom-element-not-defined>custom element not defined</my-custom-element-not-defined>
    <script>
        class MyClass extends HTMLElement
        {
            constructor()
            {
                super();
            }
        }
        customElements.define("my-custom-element-defined", MyClass);
        function myfunction(myparameter)
        {
            const mytarget = myparameter.target;
            const myproperty = mytarget.value || mytarget.innerHTML;
            let myvalue1 = myvalue2 = myproperty;
            if(myproperty.indexOf(" "))
            {
                const myvalue = myproperty.split(" ");
                myvalue1 = myvalue[0];
                myvalue2 = myvalue[1];
            }
            const mystyle = document.querySelector(":root").style;
            mystyle.setProperty("--myvar1", myvalue1);
            mystyle.setProperty("--myvar2", myvalue2);
        }
        for(const mybutton of document.querySelectorAll("button"))
        {
            mybutton.addEventListener("mouseover", myfunction);
        }
    </script>
</body>
</html>

Links

Pseudo-Classes

nth-last-of-type

picture-in-picture

placeholder-shown

External

World Wide Web Consortium (W3C)

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العربية

ASVD الكتاب المقدس ترجمة فانديك وسميث

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CSBKR Bible Kralická 1613

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DA1871 Danske Bibel 1871

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RVES Reina-Valera Antigua

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KAR Károli 1590

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JA1955 Colloquial Japanese (1955)

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MG1865 Malagasy Bible

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KORVB 개역한글

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SV1750 Statenvertaling

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NORSK Det Norsk Bibelselskap 1930

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RURSV Синодальный перевод

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VI1934 1934 Vietnamese Bible

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CUVS 简体和合本

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CUV 和合本

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