Limited availability
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
The href global attribute creates a hyperlink on the MathML element pointing to the specified URL.
The first equation links to the Wikipedia article about the mass-energy equivalence. The square root part of the second equation is a link to the SageMath calculation.
Note: You should avoid nesting MathML elements with the href attributes, just like <a> elements, as is will lead to user confusion and accessibility issues.
html,
body {
height: 100%;
}
body {
display: grid;
place-items: center;
font-size: 1.5rem;
}
<math
display="block"
href="https://en.wikipedia.org/wiki/Mass-energy_equivalence">
<mrow>
<mi>E</mi>
<mo>=</mo>
<mi>m</mi>
<msup>
<mi>c</mi>
<mn>2</mn>
</msup>
</mrow>
</math>
<math display="block">
<mi>c</mi>
<mo>=</mo>
<msqrt href="https://sagecell.sagemath.org/?z=eJwrLiwq0TCOM9I2iTPSBAAeqgPO">
<msup>
<mn>3</mn>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mn>4</mn>
<mn>2</mn>
</msup>
</msqrt>
<mo>=</mo>
<mn>5</mn>
</math>
<math href="https://example.com/">
URL
The URL to which the hyperlink points.
The href attribute is not defined in any browser-oriented specification but you can find a description in MathML 4.
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