Accessibility Improvement

// 1. Ensure ARIA attributes match proper roles

function nexsouk_fix_aria_roles($content) {

    // Simplistic approach: strip aria-* from elements without proper roles

    // Better: adjust based on your theme/structure with context

    $valid_roles = array(

        'button' => ['aria-pressed', 'aria-expanded'],

        'navigation' => ['aria-label', 'aria-labelledby'],

        'dialog' => ['aria-modal', 'aria-labelledby'],

        'tabpanel' => ['aria-hidden', 'aria-labelledby'],

        'checkbox' => ['aria-checked'],

        'link' => ['aria-current'],

        // add more as needed

    );

    foreach ($valid_roles as $role => $valid_attrs) {

        $pattern = '/<([a-z0-9]+)([^>]*role=["\']' . preg_quote($role, '/') . '["\'][^>]*)>/i';

        $content = preg_replace_callback($pattern, function ($matches) use ($valid_attrs) {

            $tag = $matches[1];

            $attrs = $matches[2];

            // Remove invalid aria-* attributes

            $attrs = preg_replace_callback('/aria-([a-zA-Z0-9_-]+)=["\'][^"\']*["\']/', function ($a) use ($valid_attrs) {

                return in_array('aria-' . $a[1], $valid_attrs) ? $a[0] : '';

            }, $attrs);

            return "<$tag$attrs>";

        }, $content);

    }

    return $content;

}

add_filter('the_content', 'nexsouk_fix_aria_roles');

// 2. Ensure iframes have a title attribute

function nexsouk_add_title_to_iframes($content) {

    return preg_replace_callback('/<iframe([^>]*)>/i', function ($matches) {

        $attrs = $matches[1];

        // Check if title is already present

        if (stripos($attrs, 'title=') === false) {

            $title = 'Embedded content from external site';

            return '<iframe title="' . esc_attr($title) . '"' . $attrs . '>';

        }

        return $matches[0];

    }, $content);

}

add_filter('the_content', 'nexsouk_add_title_to_iframes');

// 3. Ensure links have discernible names

function nexsouk_add_accessible_link_text($content) {

    return preg_replace_callback('/<a\s([^>]*href=["\'][^"\']+["\'][^>]*)>(\s*)<\/a>/i', function ($matches) {

        // If anchor has no text, add visually hidden fallback

        $new_content = $matches[0];

        $placeholder = 'Link'; // You could dynamically generate based on URL context

        if (trim($matches[2]) === '') {

            $new_content = '<a ' . $matches[1] . '><span class="sr-only">' . esc_html($placeholder) . '</span></a>';

        }

        return $new_content;

    }, $content);

}

add_filter('the_content', 'nexsouk_add_accessible_link_text');