StylePropertyMapReadOnly: get() method

The get() method of the StylePropertyMapReadOnly interface returns a CSSStyleValue object for the first value of the specified property.

Syntax

get(property)

Parameters

• property
  • : The name of the property to retrieve the value of.

Return value

A CSSStyleValue object.

Examples

Let’s get just a few properties and values. Let’s start by creating a link inside a paragraph in our HTML, and adding a definition list which we will populate with JavaScript:

<p>
  <a href="https://example.com">Link</a>
</p>
<dl id="results"></dl>

We add a bit of CSS, including a custom property and an inheritable property:

p {
  font-weight: bold;
}
a {
  --color: red;
  color: var(--color);
}

We use the Element’s computedStyleMap() to return a StylePropertyMapReadOnly object. We create an array of properties of interest and use the StylePropertyMapReadOnly’s get() method to get only those values.

// get the element
const myElement = document.querySelector("a");

// Retrieve all computed styles with computedStyleMap()
const styleMap = myElement.computedStyleMap();

// get the <dl> we'll be populating
const stylesList = document.querySelector("#results");

// array of properties we're interested in
const ofInterest = ["font-weight", "border-left-color", "color", "--color"];

// iterate over our properties of interest
for (const property of ofInterest) {
  // properties
  const cssProperty = document.createElement("dt");
  cssProperty.innerText = property;
  stylesList.appendChild(cssProperty);

  // values
  const cssValue = document.createElement("dd");
  // use get() to find the value
  cssValue.innerText = styleMap.get(property);
  stylesList.appendChild(cssValue);
}

Specifications

Browser compatibility

See also

• CSS Typed Object Model API
• Learning Houdini: the CSS Typed Object Model