CSSPageRule: style property

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

* Some parts of this feature may have varying levels of support.

The style read-only property of the CSSPageRule interface returns a CSSPageDescriptors object. This represents a CSS declaration block for a CSS @page at-rule, and exposes style information and various style-related methods and properties for the page.

Value

A CSSPageDescriptors object with properties that match the associated @page at-rule.

Note: Earlier versions of the specification defined this property as a CSSStyleDeclaration. Check the compatibility data below for your browser.

Examples

Inspecting a page rule

This example uses the Web API to inspect the content of a @page rule.

<pre id="log"></pre>

const logElement = document.querySelector("#log");
function log(text) {
  logElement.innerText = `${logElement.innerText}${text}\n`;
  logElement.scrollTop = logElement.scrollHeight;
}

#log {
  height: 230px;
  overflow: scroll;
  padding: 0.5rem;
  border: 1px solid black;
}

CSS

Below we define styles for the page using a @page rule. We assign different values for each margin property using the margin shorthand, and also specify the size. We don't set the page-orientation. This allows us to see how the properties map in the Web API object.

css

@page {
  margin: 1cm 2px 3px 4px;
  /* page-orientation: upright; */
  size: A4;
}

JavaScript

The code first gets the document stylesheet at index 1, and then gets the cssRules defined in that stylesheet. We need to get this stylesheet because the example is embedded in a separate frame with its own sheet (index 0 is the CSS for this page).

const myRules = document.styleSheets[1].cssRules;

We then iterate through the rules defined for the live example and match any that are of type CSSPageRule, as these correspond to @page rules. For the matching objects we then log the style and all its values.

for (const rule of myRules) {
  if (rule instanceof CSSPageRule) {
    log(`${rule.style}`);
    log(`margin: ${rule.style.margin}`);

    // Access properties using CamelCase properties
    log(`marginTop: ${rule.style.marginTop}`);
    log(`marginRight: ${rule.style.marginRight}`);
    log(`marginBottom: ${rule.style.marginBottom}`);
    log(`marginLeft: ${rule.style.marginLeft}`);
    log(`pageOrientation: ${rule.style.pageOrientation}`);

    // Access properties using snake-case properties
    log(`margin-top: ${rule.style["margin-top"]}`);
    log(`margin-right: ${rule.style["margin-right"]}`);
    log(`margin-left: ${rule.style["margin-left"]}`);
    log(`margin-bottom: ${rule.style["margin-bottom"]}`);
    log(`page-orientation: ${rule.style["page-orientation"]}`);

    log(`size: ${rule.style.size}`);
    log("\n");
  }
}

Results

The results are shown below. Note that the object should be a CSSPageDescriptors to match the current specification, but may be a CSSStyleDeclaration in some browsers. Note also that the corresponding values for properties in camel- and snake-case match each other and the @page declaration, and that page-orientation is the empty string "" because it is not defined in @page.

Specifications

Specification
CSS Object Model (CSSOM) # dom-csspagerule-style