@ckeditor/ckeditor5-utils/src/dom/getborderwidths.js

Miscellaneous utilities used by CKEditor 5.

/**
 * @license Copyright (c) 2003-2025, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-licensing-options
 */
/**
 * @module utils/dom/getborderwidths
 */
/**
 * Returns an object containing CSS border widths of a specified HTML element.
 *
 * @param element An element which has CSS borders.
 * @returns An object containing `top`, `left`, `right` and `bottom` properties
 * with numerical values of the `border-[top,left,right,bottom]-width` CSS styles.
 */
export default function getBorderWidths(element) {
    // Call getComputedStyle on the window the element document belongs to.
    const style = element.ownerDocument.defaultView.getComputedStyle(element);
    return {
        top: parseInt(style.borderTopWidth, 10),
        right: parseInt(style.borderRightWidth, 10),
        bottom: parseInt(style.borderBottomWidth, 10),
        left: parseInt(style.borderLeftWidth, 10)
    };
}