How do I turn off self-closing tags for markup in WordPress (for HTML5, or HTML4, for example)?

Question

I want to use HTML5 in my WordPress theme, how do I turn off wptexturize?

I don't mind WP adding breaks, but I want them to be <br> and not <br />. How do I get control over how those breaks show up in my code?

EDIT: I only really care about the <br> tag issue, I don't mind the typographic changes it makes.

EDIT2: Actually, I guess <img> tags matter too. Any self-closing standalone tags will matter here. So, <hr> might be an issue as well. Not to mention such wp_head() items as <link> and various <meta> tags.

Answer 1

Line breaks are added by wpautop(), not wptexturize(). wpautop() is also the function that automatically adds paragraph tags.

You're better off fixing the <br />'s than you are replacing the filter. Since wpautop() runs at priority 10, you can just hook in after that and fix it.

add_filter( 'the_content', 'html5_line_breaks', 25 );

function html5_line_breaks( $content ) {
    return str_replace( '<br />', '<br>', $content );
}

Edit after OP update:

WordPress functions are designed to output XHTML. In order to get rid of those trailing slashes site-wide, you're going to have to use an output buffer. You could use a filter similar to the one above to replace slashes in the post contents, but that wouldn't catch your head, sidebar, etc.

It's a bit ugly and might have a small impact on performance, but here you go (drop this in a plugin or your theme's functions.php file):

if ( !is_admin() && ( ! defined('DOING_AJAX') || ( defined('DOING_AJAX') && ! DOING_AJAX ) ) ) {
    ob_start( 'html5_slash_fixer' );
    add_action( 'shutdown', 'html5_slash_fixer_flush' );
}

function html5_slash_fixer( $buffer ) {
    return str_replace( ' />', '>', $buffer );
}

function html5_slash_fixer_flush() {
    ob_end_flush();
}

That code says if you're not in the administration area and not doing an AJAX request handling, then start buffering the output through a filter and then using the WordPress shutdown hook, output that buffer.

Answer 2

Here you go:

function my_awesome_tag_fixer( $input ){
  return preg_replace( '/(<.+)\s\/>/', '$1>', $input );
}

foreach( array('the_content', 'the_excerpt', 'comment_text') as $filter )
  add_filter( $filter, 'my_awesome_tag_fixer', 12 );

It's not the most elegant solution, but it gets it done a lot quicker than rewriting wpautop and wptexturize.

Answer 3

Just found it; self-closing tags on void elements are valid html.

In HTML5 we've allowed the / on void elements (like <meta>, <img>, <br>, <input>, etc), to ease migration to and from XML.

http://lists.whatwg.org/pipermail/help-whatwg.org/2008-August/000137.html

More infomation:

http://wiki.whatwg.org/wiki/FAQ#Should_I_close_empty_elements_with_.2F.3E_or_.3E.3F

Answer 4

This can be disabled in e.g. the theme's function.php file by taking advantage of the remove_filter() function (http://codex.wordpress.org/Function_Reference/remove_filter)

remove_filter("the_content", "wptexturize");

Answer 5

I have an starter theme for html5 and WordPress and also a function not for wptexturize, but for wpautop(). Include also other elements of HTML, like thead, tfoot, aside and use the syntax of HTML5 like <br> and <script>

/**
 * wpautop for HTML5, allowed: table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|form|map|area|blockquote|address|math|style|input|p|h[1-6]|hr|fieldset|legend|section|article|aside|header|footer|hgroup|figure|details|figcaption|summary)
 * @link http://nicolasgallagher.com/using-html5-elements-in-wordpress-post-content/
 * @author [email protected]
 */
function html5wpautop($pee, $br = 1) {
    if ( trim($pee) === '' )
            return '';
     
    $pee = $pee . "\n"; // just to make things a little easier, pad the end
    $pee = preg_replace('|<br />\s*<br />|', "\n\n", $pee);
    // Space things out a little
    // *insertion* of section|article|aside|header|footer|hgroup|figure|details|figcaption|summary
    $allblocks = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|form|map|area|blockquote|address|math|style|input|p|h[1-6]|hr|fieldset|legend|section|article|aside|header|footer|hgroup|figure|details|figcaption|summary)';
    $pee = preg_replace('!(<' . $allblocks . '[^>]*>)!', "\n$1", $pee);
    $pee = preg_replace('!(</' . $allblocks . '>)!', "$1\n\n", $pee);
    $pee = str_replace(array("\r\n", "\r"), "\n", $pee); // cross-platform newlines
    if ( strpos($pee, '<object') !== false ) {
            $pee = preg_replace('|\s*<param([^>]*)>\s*|', "<param$1>", $pee); // no pee inside object/embed
            $pee = preg_replace('|\s*</embed>\s*|', '</embed>', $pee);
    }
    $pee = preg_replace("/\n\n+/", "\n\n", $pee); // take care of duplicates
    // make paragraphs, including one at the end
    $pees = preg_split('/\n\s*\n/', $pee, -1, PREG_SPLIT_NO_EMPTY);
    $pee = '';
    foreach ( $pees as $tinkle )
            $pee .= '<p>' . trim($tinkle, "\n") . "</p>\n";
    $pee = preg_replace('|<p>\s*</p>|', '', $pee); // under certain strange conditions it could create a P of entirely whitespace
    // *insertion* of section|article|aside
    $pee = preg_replace('!<p>([^<]+)</(div|address|form|section|article|aside)>!', "<p>$1</p></$2>", $pee);
    $pee = preg_replace('!<p>\s*(</?' . $allblocks . '[^>]*>)\s*</p>!', "$1", $pee); // don't pee all over a tag
    $pee = preg_replace("|<p>(<li.+?)</p>|", "$1", $pee); // problem with nested lists
    $pee = preg_replace('|<p><blockquote([^>]*)>|i', "<blockquote$1><p>", $pee);
    $pee = str_replace('</blockquote></p>', '</p></blockquote>', $pee);
    $pee = preg_replace('!<p>\s*(</?' . $allblocks . '[^>]*>)!', "$1", $pee);
    $pee = preg_replace('!(</?' . $allblocks . '[^>]*>)\s*</p>!', "$1", $pee);
    if ($br) {
            $pee = preg_replace_callback('/<(script|style).*?<\/\\1>/s', create_function('$matches', 'return str_replace("\n", "<WPPreserveNewline />", $matches[0]);'), $pee);
            $pee = preg_replace('|(?<!<br />)\s*\n|', "<br />\n", $pee); // optionally make line breaks
            $pee = str_replace('<WPPreserveNewline />', "\n", $pee);
    }
    $pee = preg_replace('!(</?' . $allblocks . '[^>]*>)\s*<br />!', "$1", $pee);
    // *insertion* of img|figcaption|summary
    $pee = preg_replace('!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol|img|figcaption|summary)[^>]*>)!', '$1', $pee);
    if (strpos($pee, '<pre') !== false)
            $pee = preg_replace_callback('!(<pre[^>]*>)(.*?)</pre>!is', 'clean_pre', $pee );
    $pee = preg_replace( "|\n</p>$|", '</p>', $pee );

    return $pee;
}

// remove the original wpautop function
remove_filter('the_excerpt', 'wpautop');
remove_filter('the_content', 'wpautop');

// add our new html5autop function
add_filter('the_excerpt', 'html5wpautop');
add_filter('the_content', 'html5wpautop');

See more on the SVN of the HTML5 starter theme, not a framework!

Answer 6

Disable WPtexturize plugin worked for me: Disable WPtexturize

It's pretty straigtforward though:

remove_filter('the_content', 'wptexturize');
remove_filter('the_excerpt', 'wptexturize');
remove_filter('comment_text', 'wptexturize');