HTML5 MathML open Attribute

Last Updated : 23 Jul, 2025

This attribute holds the opening parentheses of any equation same as close attribute. This attribute is accepted by <mfenched> tag.

Syntax:

<element open="parentheses">

Attribute Value:

Parentheses: Holds the parentheses which will be used to open any equation.

Below example illustrate the open Attribute in HTML5 MathML:

Example:

HTML

<!DOCTYPE html>
<html>

<head>
    <title>HTML5 MathML open attribute</title>
</head>

<body>
    <center>
        <h1 style="color:green">
            GeeksforGeeks
        </h1>

        <h3>HTML5 MathML open attribute</h3>
        <math>
            <mfenced open="{" close="}" separators="">
                <mrow>
                    <msup>
                        <mi>x</mi>
                        <mn>2</mn>
                    </msup>
                    <mo>+</mo>
                    <msup>
                        <mi>y</mi>
                        <mn>2</mn>
                    </msup>
                    <mo>=</mo>
                    <msup>
                        <mi>z</mi>
                        <mn>2</mn>
                    </msup>
                </mrow>
                </mfenced>
        </math>
    </center>
</body>

</html>