JSFiddle - React, Tailwind, and code Playground

HTML

<div id="frntnd-edtr" class="col-xs-12">
        <!-- Nav tabs -->
        <ul class="nav nav-tabs" role="tablist">
            <li role="presentation" class="active"><a href="#status" aria-controls="status-tab" role="tab" data-toggle="tab" aria-expanded="true"><i class="material-icons">sms</i><p>حالة</p></a></li>
            <li role="presentation" class=""><a href="#post" aria-controls="post" role="tab" data-toggle="tab" aria-expanded="false"><i class="material-icons">description</i><p>مقالة</p></a></li>
            <li role="presentation" class=""><a href="#quote" aria-controls="quote" role="tab" data-toggle="tab" aria-expanded="false"><i class="material-icons">format_quote</i><p>اقتباس</p></a></li>
            <li role="presentation" class=""><a href="#story" aria-controls="story" role="tab" data-toggle="tab" aria-expanded="false"><i class="material-icons">import_contacts</i><p>قصة قصيرة</p></a></li>
            <li role="presentation" class=""><a href="#chapter" aria-controls="chapter" role="tab" data-toggle="tab" aria-expanded="false"><i class="material-icons">receipt</i><p>فصل من رواية</p></a></li>
        </ul>
        <!-- Tab panes -->
        <div class="tab-content">
            <div role="tabpanel" class="tab-pane active" id="status">
                <form class="col-xs-12" method="post" action="" wtx-context="839CDBD9-2EB6-4C4D-91C1-AE6F0F27F4A0">
                    <input type="hidden" name="post-type" value="status" wtx-context="D32E77E0-5799-4D33-B130-85A998170970">
                    <textarea name="status-content" class="mg-input col-xs-10 col-sm-11" placeholder="ماذا؟"></textarea>
                    <fieldset class="actions">
                        <button id="send-status" type="submit" class="col-xs-2 col-sm-1"><i class="material-icons">send</i></button>
                    </fieldset>
                </form>
            </div>
            <div role="tabpanel" class="tab-pane" id="post">
                <form class="col-xs-12"...

JavaScript

var textareas = document.getElementById("frntnd-edtr").getElementsByTagName("textarea"),x;
for (x in textareas) {
	textareas[x].oninput = function() {
		for (z in textareas) {
			if(textareas[z] !== this) {
				textareas[z].value = this.value;
			}
		}
	};
}