Add upstream plugins

Signed-off-by: Adrian Nöthlich <git@promasu.tech>

wp-content/plugins/all-in-one-event-calendar/lib/html/element/interface.php

@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * Interface for HTML elements.
+ *
+ * In this context element is a complex collection of HTML tags
+ * rendered to suit specific needs.
+ *
+ * @author     Time.ly Network, Inc.
+ * @since      2.0
+ * @package    Ai1EC
+ * @subpackage Ai1EC.Html
+ */
+interface Ai1ec_Html_Element_Interface {
+
+    /**
+     * Set attribute for renderable element.
+     *
+     * Attributes are object specific.
+     *
+     * @param string $attribute Name of attribute to set.
+     * @param mixed  $value     Value to set for attribute.
+     *
+     * @return Ai1ec_Html_Element_Interface Instance of self for chaining.
+     */
+    public function set( $attribute, $value );
+
+    /**
+     * Generate HTML snippet for inclusion in page.
+     *
+     * @param string $snippet Particle to append to result.
+     *
+     * @return string HTML snippet.
+     *
+     * @throws Ai1ec_Html_Exception If rendering may not be completed.
+     */
+    public function render( $snippet = '' );
+
+}