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Add support for making tags focusable for improved assistive technologies support #398

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Add support for making tags focusable for improved assistive technologies support #398

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372b183
Merge pull request #1 from michelf/lib
sunnywalker Oct 16, 2018
060b9e5
make specific tags focusable for AT
sunnywalker Jan 5, 2024
3dc4a8b
Merge branch 'michelf:lib' into lib
sunnywalker Jan 5, 2024
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10 changes: 10 additions & 0 deletions Michelf/MarkdownExtra.php
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Original file line number Diff line number Diff line change
Expand Up @@ -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 $this->id_class_attr_catch_re expression
* and return the HTML-formatted list of attributes.
Expand Down Expand Up @@ -254,6 +260,10 @@ protected function doExtraAttributes($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) . '"';
Expand Down
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