Unnecessary code

On every page where I add awesome support shortcode at the end of page we can find additional code. Why? Is it necessary?

<div id="wp-link-backdrop" style="display: none"></div>
<div id="wp-link-wrap" class="wp-core-ui" style="display: none" role="dialog" aria-labelledby="link-modal-title">
		<form id="wp-link" tabindex="-1">
		<input type="hidden" id="_ajax_linking_nonce" name="_ajax_linking_nonce" value="c8a73b5e67">		<h1 id="link-modal-title">Insert/edit link</h1>
		<button type="button" id="wp-link-close"><span class="screen-reader-text">Close</span></button>
		<div id="link-selector">
			<div id="link-options">
				<p class="howto" id="wplink-enter-url">Enter the destination URL</p>
				<div>
					<label><span>URL</span>
					<input id="wp-link-url" type="text" aria-describedby="wplink-enter-url"></label>
				</div>
				<div class="wp-link-text-field">
					<label><span>Link Text</span>
					<input id="wp-link-text" type="text"></label>
				</div>
				<div class="link-target">
					<label><span></span>
					<input type="checkbox" id="wp-link-target"> Open link in a new tab</label>
				</div>
			</div>
			<p class="howto" id="wplink-link-existing-content">Or link to existing content</p>
			<div id="search-panel">
				<div class="link-search-wrapper">
					<label>
						<span class="search-label">Search</span>
						<input type="search" id="wp-link-search" class="link-search-field" autocomplete="off" aria-describedby="wplink-link-existing-content">
						<span class="spinner"></span>
					</label>
				</div>
				<div id="search-results" class="query-results" tabindex="0">
					<ul></ul>
					<div class="river-waiting">
						<span class="spinner"></span>
					</div>
				</div>
				<div id="most-recent-results" class="query-results" tabindex="0">
					<div class="query-notice" id="query-notice-message">
						<em class="query-notice-default">No search term specified. Showing recent items.</em>
						<em class="query-notice-hint screen-reader-text">Search or use up and down arrow keys to select an item.</em>
					</div>
					<ul></ul>
					<div class="river-waiting">
						<span class="spinner"></span>
					</div>
 				</div>
 			</div>
		</div>
		<div class="submitbox">
			<div id="wp-link-cancel">
				<button type="button" class="button">Cancel</button>
			</div>
			<div id="wp-link-update">
				<input type="submit" value="Add Link" class="button button-primary" id="wp-link-submit" name="wp-link-submit">
			</div>
		</div>
		</form>
		</div>