diff --git a/Michelf/MarkdownExtra.php b/Michelf/MarkdownExtra.php
index f814cde..ea571c3 100644
--- a/Michelf/MarkdownExtra.php
+++ b/Michelf/MarkdownExtra.php
@@ -208,6 +208,12 @@ protected function teardown() {
 	 */
 	protected string $id_class_attr_nocatch_re = '\{(?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,}[ ]*\}';
 
+	/**
+	 * Expression to use when determining whether to make a tag with an id focusable
+	 * @var string
+	 */
+	protected $id_focusable_tags_re = '/h[1-6]/i';
+
 	/**
 	 * Parse attributes caught by the $this->id_class_attr_catch_re expression
 	 * and return the HTML-formatted list of attributes.
@@ -254,6 +260,10 @@ protected function doExtraAttributes($tag_name, $attr, $defaultIdValue = null, $
 		$attr_str = "";
 		if (!empty($id)) {
 			$attr_str .= ' id="'.$this->encodeAttribute($id) .'"';
+			// make specified tags focusable for assistive technologies anchor targets
+			if ($this->id_focusable_tags_re && preg_match($this->id_focusable_tags_re, $tag_name)) {
+				$attr_str .= ' tabindex="-1"';
+			}
 		}
 		if (!empty($classes)) {
 			$attr_str .= ' class="'. implode(" ", $classes) . '"';