CSSPageRule: style property

Value

A CSSPageDescriptors object.

Although the style property itself is read-only in the sense that you can't replace the CSSPageDescriptors object, you can still assign to the style property directly, which is equivalent to assigning to its cssText property. You can also modify the CSSPageDescriptors object using the setProperty() and removeProperty() methods.

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.

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

JavaScript

The MDN live sample infrastructure combines all the CSS blocks in the example into a single inline style with the id css-output, so we first use document.getElementById() to find that sheet.

const myRules = document.getElementById("css-output").sheet.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

Browser compatibility