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diff --git a/vendor/masterminds/html5/src/HTML5/Parser/EventHandler.php b/vendor/masterminds/html5/src/HTML5/Parser/EventHandler.php
new file mode 100644
index 000000000..3da71a3fd
--- /dev/null
+++ b/vendor/masterminds/html5/src/HTML5/Parser/EventHandler.php
@@ -0,0 +1,122 @@
+<?php
+namespace Masterminds\HTML5\Parser;
+
+/**
+ * Standard events for HTML5.
+ *
+ * This is roughly analogous to a SAX2 or expat-style interface.
+ * However, it is tuned specifically for HTML5, according to section 8
+ * of the HTML5 specification.
+ *
+ * An event handler receives parser events. For a concrete
+ * implementation, see DOMTreeBuilder.
+ *
+ * Quirks support in the parser is limited to close-in syntax (malformed
+ * tags or attributes). Higher order syntax and semantic issues with a
+ * document (e.g. mismatched tags, illegal nesting, etc.) are the
+ * responsibility of the event handler implementation.
+ *
+ * See HTML5 spec section 8.2.4
+ */
+interface EventHandler
+{
+
+    const DOCTYPE_NONE = 0;
+
+    const DOCTYPE_PUBLIC = 1;
+
+    const DOCTYPE_SYSTEM = 2;
+
+    /**
+     * A doctype declaration.
+     *
+     * @param string $name
+     *            The name of the root element.
+     * @param int $idType
+     *            One of DOCTYPE_NONE, DOCTYPE_PUBLIC, or DOCTYPE_SYSTEM.
+     * @param string $id
+     *            The identifier. For DOCTYPE_PUBLIC, this is the public ID. If DOCTYPE_SYSTEM,
+     *            then this is a system ID.
+     * @param boolean $quirks
+     *            Indicates whether the builder should enter quirks mode.
+     */
+    public function doctype($name, $idType = 0, $id = null, $quirks = false);
+
+    /**
+     * A start tag.
+     *
+     * IMPORTANT: The parser watches the return value of this event. If this returns
+     * an integer, the parser will switch TEXTMODE patters according to the int.
+     *
+     * This is how the Tree Builder can tell the Tokenizer when a certain tag should
+     * cause the parser to go into RAW text mode.
+     *
+     * The HTML5 standard requires that the builder is the one that initiates this
+     * step, and this is the only way short of a circular reference that we can
+     * do that.
+     *
+     * Example: if a startTag even for a `script` name is fired, and the startTag()
+     * implementation returns Tokenizer::TEXTMODE_RAW, then the tokenizer will
+     * switch into RAW text mode and consume data until it reaches a closing
+     * `script` tag.
+     *
+     * The textmode is automatically reset to Tokenizer::TEXTMODE_NORMAL when the
+     * closing tag is encounter. **This behavior may change.**
+     *
+     * @param string $name
+     *            The tag name.
+     * @param array $attributes
+     *            An array with all of the tag's attributes.
+     * @param boolean $selfClosing
+     *            An indicator of whether or not this tag is self-closing (<foo/>)
+     * @return int One of the Tokenizer::TEXTMODE_* constants.
+     */
+    public function startTag($name, $attributes = array(), $selfClosing = false);
+
+    /**
+     * An end-tag.
+     */
+    public function endTag($name);
+
+    /**
+     * A comment section (unparsed character data).
+     */
+    public function comment($cdata);
+
+    /**
+     * A unit of parsed character data.
+     *
+     * Entities in this text are *already decoded*.
+     */
+    public function text($cdata);
+
+    /**
+     * Indicates that the document has been entirely processed.
+     */
+    public function eof();
+
+    /**
+     * Emitted when the parser encounters an error condition.
+     */
+    public function parseError($msg, $line, $col);
+
+    /**
+     * A CDATA section.
+     *
+     * @param string $data
+     *            The unparsed character data.
+     */
+    public function cdata($data);
+
+    /**
+     * This is a holdover from the XML spec.
+     *
+     * While user agents don't get PIs, server-side does.
+     *
+     * @param string $name
+     *            The name of the processor (e.g. 'php').
+     * @param string $data
+     *            The unparsed data.
+     */
+    public function processingInstruction($name, $data = null);
+}