@uifabric/utilities/lib/initializeDir.js

Fluent UI React utilities for building components.

import { getWindow } from './dom/getWindow';
export function initializeDir(win) {
    var w = (win || getWindow());
    if (w && !w.__hasInitializedDir__) {
        w.__hasInitializedDir__ = true;
        // Ensure that the documentElement has a 'dir' attribute.
        var documentElement = w.document.documentElement;
        if (!documentElement.hasAttribute('dir')) {
            documentElement.setAttribute('dir', 'ltr');
        }
    }
}
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