The SVGStyleElement interface corresponds to the SVG <style> element.

This interface also inherits properties from its parent interface, SVGElement.

SVGStyleElement.type Deprecated

A string corresponding to the type attribute of the given element.

SVGStyleElement.media

A string corresponding to the media attribute of the given element.

SVGStyleElement.title

A string corresponding to the title attribute of the given element.

SVGStyleElement.sheet Read only

Returns the CSSStyleSheet object associated with the given element, or null if there is none.

SVGStyleElement.disabled

A boolean value indicating whether or not the associated stylesheet is disabled.

This interface doesn't implement any specific methods, but inherits methods from its parent interface, SVGElement.

To dynamically create an SVG style element (SVGStyleElement), you need to use Document.createElementNS(), specifying a style element in the SVG namespace.

Given the following SVG element:

<svg
  xmlns="http://www.w3.org/2000/svg"
  xmlns:xlink="http://www.w3.org/1999/xlink">
  <circle cx="50" cy="50" r="25" />
</svg>

You can create an SVG style element as shown:

// Get the SVG element object by tag name
const svg = document.querySelector("svg");

// Create the `style` element in the SVG namespace
const style = document.createElementNS("http://www.w3.org/2000/svg", "style");
const node = document.createTextNode("circle { fill: red; }");
style.appendChild(node);

// Append the style element to the SVG element
svg.appendChild(style);

You can access an SVG style element that was defined in HTML (or an SVG file) using the normal HTML methods for getting tags, ids, and so on. These include: Document.getElementsByTagName(), Document.getElementById(), Document.querySelector(), Document.querySelectorAll(), and so on.

For example, consider the HTML below that defines an SVG file with a style element.

<svg
  xmlns="http://www.w3.org/2000/svg"
  xmlns:xlink="http://www.w3.org/1999/xlink">
  <style id="circle_style_id">
    circle {
      fill: gold;
      stroke: green;
      stroke-width: 3px;
    }
  </style>
  <circle cx="50" cy="50" r="25" />
</svg>

To fetch the first style element in the first svg element, you might use Document.querySelector() as shown below.

const svg = document.querySelector("svg");
const style = svg.querySelector("style");

Alternatively, you can could use Document.getElementById(), specifying the tag id:

const svg = document.querySelector("svg");
const style = svg.getElementById("circle_style_id");

Or just get the element from document by id (in this case using document.querySelector()):

const style = document.querySelector("#circle_style_id");

This example demonstrates how to get and set the properties of a style element, which in this case was specified in an SVG definition.

The HTML contains an SVG definition for a <circle> with a <style> element, along with an HTML <button> element that will be used to enable and disable the style, and an HTML <textarea> element for logging the property values.

<button>Disable</button>
<textarea id="log" rows="6" cols="90"></textarea>
<svg
  xmlns="http://www.w3.org/2000/svg"
  xmlns:xlink="http://www.w3.org/1999/xlink">
  <style id="circle_style_id" media="all and (min-width: 600px)">
    circle {
      fill: gold;
      stroke: green;
      stroke-width: 3px;
    }
  </style>
  <circle cx="60" cy="60" r="50" />
</svg>

Note that above we have set the media attribute on the style tag. We have not set type as it is deprecated, or disabled because there is no such attribute (only the property on the element).

The code below gets the style element (an SVGStyleElement) using its id.

const svg = document.querySelector("svg");
const style = svg.getElementById("circle_style_id");

We then add a function to log the style properties. This is called after initialization, whenever the frame resizes, and if the button is pressed.

// Get logging text area
const log = document.getElementById("log");

function setLogText() {
  //Log current values of properties
  log.value = `style.media: ${style.media} (frame width: ${window.innerWidth})\n`; // 'all' by default
  log.value += `style.title: ${style.title}\n`; // no default value
  log.value += `style.disabled: ${style.disabled}\n`; // 'false' by default
  log.value += `style.type: ${style.type}\n`; // deprecated (do not use)
  log.value += `style.sheet.rules[0].cssText: ${style.sheet.rules[0].cssText}\n`;
}

// Log initial property values
setLogText();

// Log when the frame resizes
addEventListener("resize", () => {
  setLogText();
});

Last of all we set an event handler for the button. When the button is clicked the disabled property is toggled. This also updates the log and the button text.

const button = document.querySelector("button");

button.addEventListener("click", () => {
  style.disabled = !style.disabled;
  button.textContent = style.disabled ? "Enable" : "Disable";

  // Log after button presses
  setLogText();
});

The result is shown below. Toggle the button to enable and disable the SVG style element. If the SVG style is not disabled, you can also resize the window width to see the effect of the media property on the style when the frame holding the live example is 600px wide.

• HTMLStyleElement