HTML <svg> data-* Attribute

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HTML <table>

A data-* attribute on an <svg> tag attaches additional data to the svg image.

To create a custom attribute, replace * with a lowercase string, such as data-id, data-status, or data-location.

Example

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A custom data-shape attribute on an <svg> image.
The attribute value is not visible, but is readable by JavaScript.

<svg data-shape="Rectangle" width="300" height="100">
  <rect width="300" height="100" fill="orangered" />
</svg>

Using data-*

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The data-* attribute adds custom information to an <svg> element.

The * part is replaced with a lowercase string, such as data-id, data-cost, or data-location.

An <svg> element can have any number of data-* attributes, each with their own name.

Using data-* attributes reduces the need for requests to the server.

Note: The data-* attribute is not visible and does not change the appearance of the svg.

Syntax

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<svg data-*="value">

Note: The * can be any string, such as data-id, data-cost, data-supplier, etc.

Values

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Value	Description
value	A string value. Can be numeric, alphanumeric, JSON, etc.

More Examples

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A custom data-subject attribute on an <svg> element.
Clicking the button will display the subject value.

<svg id="mysvg" data-subject="Simple rectangle" width="300" height="100">
  <rect width="300" height="100" fill="orangered" />
</svg>

<br/><br/>
<button onclick="toggle();">Show data</button>

<script>
  let toggle = () => {
    let element = document.getElementById("mysvg");
    alert("Subject = " + element.getAttribute('data-subject'));
  }
</script>

Code explanation

The <svg> tag has a custom data-subject attribute.

The shape of the svg is stored in the data-subject.

Clicks are handled by the onclick event.

Onclick invokes a JavaScript function that extracts and displays the <svg> subject.

Note: Notice how the shape displays immediately without server call.

Browser support

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Here is when data-* support started for each browser: