panel
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	function panel() {
		return _class('html')->panel(['title' => 'Panel title', 'body' => 'Panel content']);
	}
	function panel($extra = []) {
		$extra['id'] = $extra['id'] ?: __FUNCTION__.'_'.++$this->_ids[__FUNCTION__];
		$extra['class'] = $extra['class'] ?: 'panel panel-default';
		return
			'<div class="'.implode(' ', array_filter([$extra['class'], $extra['class_add']])).'" id="'.$extra['id'].'">
				<div class="panel-heading">
					<h3 class="panel-title">'.$extra['title'].'</h3>
				</div>
				<div class="panel-body">'.$extra['body'].'</div>
			</div>';
	}

Panel title

Panel content