diff --git a/adminer/create.inc.php b/adminer/create.inc.php
index 64de551a..c398291d 100644
--- a/adminer/create.inc.php
+++ b/adminer/create.inc.php
@@ -143,7 +143,7 @@ if ($suhosin && count($row["fields"]) > $suhosin) {
 <?php echo lang('Auto Increment'); ?>: <input name="Auto_increment" size="6" value="<?php echo intval($row["Auto_increment"]); ?>">
 <?php echo lang('Comment'); ?>: <input name="Comment" value="<?php echo h($row["Comment"]); ?>" maxlength="60">
 <script type="text/javascript">// <![CDATA[
-document.write('<label><input type="checkbox"<?php if ($column_comments) { ?> checked="checked"<?php } ?> onclick="column_comments_click(this.checked);"><?php echo lang('Show column comments'); ?></label>');
+document.write('<label><input type="checkbox"<?php if ($column_comments) { ?> checked<?php } ?> onclick="column_comments_click(this.checked);"><?php echo lang('Show column comments'); ?></label>');
 // ]]></script>
 <p>
 <input type="hidden" name="token" value="<?php echo $token; ?>">
diff --git a/adminer/db.inc.php b/adminer/db.inc.php
index 5fcdbb7f..d72f21d8 100644
--- a/adminer/db.inc.php
+++ b/adminer/db.inc.php
@@ -53,7 +53,7 @@ if (!$table_status) {
 	foreach ($table_status as $row) {
 		$name = $row["Name"];
 		table_comment($row);
-		echo '<tr' . odd() . '><td><input type="checkbox" name="' . (isset($row["Rows"]) ? 'tables' : 'views') . '[]" value="' . h($name) . '"' . (in_array($name, $tables_views, true) ? ' checked="checked"' : '') . ' onclick="form_uncheck(\'check-all\');">';
+		echo '<tr' . odd() . '><td><input type="checkbox" name="' . (isset($row["Rows"]) ? 'tables' : 'views') . '[]" value="' . h($name) . '"' . (in_array($name, $tables_views, true) ? ' checked' : '') . ' onclick="form_uncheck(\'check-all\');">';
 		echo '<th><a href="' . h($SELF) . 'table=' . urlencode($name) . '">' . h($name) . '</a>';
 		if (isset($row["Rows"])) {
 			echo "<td>$row[Engine]<td>$row[Collation]";
diff --git a/adminer/dump.inc.php b/adminer/dump.inc.php
index 60d4d1d3..26882813 100644
--- a/adminer/dump.inc.php
+++ b/adminer/dump.inc.php
@@ -174,14 +174,14 @@ echo "<tr><th>" . lang('Data') . "<td><select name='data_style'><option>" . opti
 <table cellspacing="0">
 <?php
 if (strlen($_GET["db"])) {
-	$checked = (strlen($_GET["dump"]) ? "" : " checked='checked'");
+	$checked = (strlen($_GET["dump"]) ? "" : " checked");
 	echo "<thead><tr>";
 	echo "<th style='text-align: left;'><label><input type='checkbox' id='check-tables'$checked onclick='form_check(this, /^tables\\[/);'>" . lang('Tables') . "</label>";
 	echo "<th style='text-align: right;'><label>" . lang('Data') . "<input type='checkbox' id='check-data'$checked onclick='form_check(this, /^data\\[/);'></label>";
 	echo "</thead>\n";
 	$views = "";
 	foreach (table_status() as $row) {
-		$checked = (strlen($_GET["dump"]) && $row["Name"] != $_GET["dump"] ? '' : " checked='checked'");
+		$checked = (strlen($_GET["dump"]) && $row["Name"] != $_GET["dump"] ? '' : " checked");
 		$print = "<tr><td><label><input type='checkbox' name='tables[]' value='" . h($row["Name"]) . "'$checked onclick=\"form_uncheck('check-tables');\">" . h($row["Name"]) . "</label>";
 		if (!$row["Engine"]) {
 			$views .= "$print\n";
@@ -191,10 +191,10 @@ if (strlen($_GET["db"])) {
 	}
 	echo $views;
 } else {
-	echo "<thead><tr><th style='text-align: left;'><label><input type='checkbox' id='check-databases' checked='checked' onclick='form_check(this, /^databases\\[/);'>" . lang('Database') . "</label></thead>\n";
+	echo "<thead><tr><th style='text-align: left;'><label><input type='checkbox' id='check-databases' checked onclick='form_check(this, /^databases\\[/);'>" . lang('Database') . "</label></thead>\n";
 	foreach (get_databases() as $db) {
 		if (!information_schema($db)) {
-			echo '<tr><td><label><input type="checkbox" name="databases[]" value="' . h($db) . '" checked="checked" onclick="form_uncheck(\'check-databases\');">' . h($db) . "</label>\n";
+			echo '<tr><td><label><input type="checkbox" name="databases[]" value="' . h($db) . '" checked onclick="form_uncheck(\'check-databases\');">' . h($db) . "</label>\n";
 		}
 	}
 }
diff --git a/adminer/edit.inc.php b/adminer/edit.inc.php
index c134e988..03358e2f 100644
--- a/adminer/edit.inc.php
+++ b/adminer/edit.inc.php
@@ -85,7 +85,7 @@ if ($fields) {
 				$create = $dbh->result($dbh->query("SHOW CREATE TABLE " . idf_escape($_GET["edit"])), 1);
 			}
 			$checked = ($_POST ? $_POST["on_update"][bracket_escape($name)] : preg_match("~\n\\s*" . preg_quote(idf_escape($name), '~') . " timestamp.* on update CURRENT_TIMESTAMP~i", $create));
-			echo '<label><input type="checkbox" name="on_update[' . h(bracket_escape($name)) . ']" value="1"' . ($checked ? ' checked="checked"' : '') . '>' . lang('ON UPDATE CURRENT_TIMESTAMP') . '</label>';
+			echo '<label><input type="checkbox" name="on_update[' . h(bracket_escape($name)) . ']" value="1"' . ($checked ? ' checked' : '') . '>' . lang('ON UPDATE CURRENT_TIMESTAMP') . '</label>';
 		}
 		echo "\n";
 	}
diff --git a/adminer/event.inc.php b/adminer/event.inc.php
index 07208ef5..3e239899 100644
--- a/adminer/event.inc.php
+++ b/adminer/event.inc.php
@@ -43,7 +43,7 @@ if ($_POST) {
 <tr><th><?php echo lang('Every'); ?><td><input name="INTERVAL_VALUE" value="<?php echo h($row["INTERVAL_VALUE"]); ?>" size="6"> <select name="INTERVAL_FIELD"><?php echo optionlist($intervals, $row["INTERVAL_FIELD"]); ?></select>
 <tr><th><?php echo lang('Status'); ?><td><select name="STATUS"><?php echo optionlist($statuses, $row["STATUS"]); ?></select>
 <tr><th><?php echo lang('Comment'); ?><td><input name="EVENT_COMMENT" value="<?php echo h($row["EVENT_COMMENT"]); ?>" maxlength="64">
-<tr><th>&nbsp;<td><label><input type="checkbox" name="ON_COMPLETION" value="PRESERVE"<?php echo ($row["ON_COMPLETION"] == "PRESERVE" ? " checked='checked'" : ""); ?>><?php echo lang('On completion preserve'); ?></label>
+<tr><th>&nbsp;<td><label><input type="checkbox" name="ON_COMPLETION" value="PRESERVE"<?php echo ($row["ON_COMPLETION"] == "PRESERVE" ? " checked" : ""); ?>><?php echo lang('On completion preserve'); ?></label>
 </table>
 <p><textarea name="EVENT_DEFINITION" rows="10" cols="80" style="width: 98%;"><?php echo h($row["EVENT_DEFINITION"]); ?></textarea>
 <p>
diff --git a/adminer/include/adminer.inc.php b/adminer/include/adminer.inc.php
index 919fd192..f7ce3452 100644
--- a/adminer/include/adminer.inc.php
+++ b/adminer/include/adminer.inc.php
@@ -165,7 +165,7 @@ class Adminer {
 			if ($index["type"] == "FULLTEXT") {
 				echo "(<i>" . implode("</i>, <i>", array_map('h', $index["columns"])) . "</i>) AGAINST";
 				echo " <input name='fulltext[$i]' value='" . h($_GET["fulltext"][$i]) . "'>";
-				echo "<label><input type='checkbox' name='boolean[$i]' value='1'" . (isset($_GET["boolean"][$i]) ? " checked='checked'" : "") . ">" . lang('BOOL') . "</label>";
+				echo "<label><input type='checkbox' name='boolean[$i]' value='1'" . (isset($_GET["boolean"][$i]) ? " checked" : "") . ">" . lang('BOOL') . "</label>";
 				echo "<br>\n";
 			}
 		}
@@ -196,7 +196,7 @@ class Adminer {
 		foreach ((array) $_GET["order"] as $key => $val) {
 			if (isset($columns[$val])) {
 				echo "<div><select name='order[$i]'><option>" . optionlist($columns, $val, true) . "</select>";
-				echo "<label><input type='checkbox' name='desc[$i]' value='1'" . (isset($_GET["desc"][$key]) ? " checked='checked'" : "") . ">" . lang('descending') . "</label></div>\n";
+				echo "<label><input type='checkbox' name='desc[$i]' value='1'" . (isset($_GET["desc"][$key]) ? " checked" : "") . ">" . lang('descending') . "</label></div>\n";
 				$i++;
 			}
 		}
diff --git a/adminer/include/editing.inc.php b/adminer/include/editing.inc.php
index 7c515257..b8feae03 100644
--- a/adminer/include/editing.inc.php
+++ b/adminer/include/editing.inc.php
@@ -87,8 +87,8 @@ function edit_fields($fields, $collations, $type = "TABLE", $allowed = 0, $forei
 <th><?php if ($display) { ?><input name="fields[<?php echo $i; ?>][field]" value="<?php echo h($field["field"]); ?>" onchange="<?php echo (strlen($field["field"]) || count($fields) > 1 ? "" : "editing_add_row(this, $allowed); "); ?>editing_name_change(this);" maxlength="64"><?php } ?><input type="hidden" name="fields[<?php echo $i; ?>][orig]" value="<?php echo h($field[($_POST ? "orig" : "field")]); ?>">
 <?php edit_type("fields[$i]", $field, $collations, $foreign_keys); ?>
 <?php if ($type == "TABLE") { ?>
-<td><input type="checkbox" name="fields[<?php echo $i; ?>][null]" value="1"<?php if ($field["null"]) { ?> checked="checked"<?php } ?>>
-<td><input type="radio" name="auto_increment_col" value="<?php echo $i; ?>"<?php if ($field["auto_increment"]) { ?> checked="checked"<?php } ?>>
+<td><input type="checkbox" name="fields[<?php echo $i; ?>][null]" value="1"<?php if ($field["null"]) { ?> checked<?php } ?>>
+<td><input type="radio" name="auto_increment_col" value="<?php echo $i; ?>"<?php if ($field["auto_increment"]) { ?> checked<?php } ?>>
 <td<?php echo ($column_comments ? "" : " class='hidden'"); ?>><input name="fields[<?php echo $i; ?>][comment]" value="<?php echo h($field["comment"]); ?>" maxlength="255">
 <?php } ?>
 <?php
diff --git a/adminer/include/functions.inc.php b/adminer/include/functions.inc.php
index a918c534..4c5dc74b 100644
--- a/adminer/include/functions.inc.php
+++ b/adminer/include/functions.inc.php
@@ -36,7 +36,7 @@ function optionlist($options, $selected = null, $use_keys = false) {
 			$return .= '<optgroup label="' . h($k) . '">';
 		}
 		foreach ((is_array($v) ? $v : array($k => $v)) as $key => $val) {
-			$return .= '<option' . ($use_keys || is_string($key) ? ' value="' . h($key) . '"' : '') . (($use_keys || is_string($key) ? (string) $key : $val) === $selected ? ' selected="selected"' : '') . '>' . h($val);
+			$return .= '<option' . ($use_keys || is_string($key) ? ' value="' . h($key) . '"' : '') . (($use_keys || is_string($key) ? (string) $key : $val) === $selected ? ' selected' : '') . '>' . h($val);
 		}
 		if (is_array($v)) {
 			$return .= '</optgroup>';
@@ -293,18 +293,18 @@ function input($field, $value, $function) {
 	$name = h(bracket_escape($field["field"]));
 	echo "<td class='function'>";
 	if ($field["type"] == "enum") {
-		echo "&nbsp;<td>" . (isset($_GET["select"]) ? " <label><input type='radio' name='fields[$name]' value='-1' checked='checked'><em>" . lang('original') . "</em></label>" : "");
+		echo "&nbsp;<td>" . (isset($_GET["select"]) ? " <label><input type='radio' name='fields[$name]' value='-1' checked><em>" . lang('original') . "</em></label>" : "");
 		if ($field["null"] || isset($_GET["default"])) {
-			echo " <label><input type='radio' name='fields[$name]' value=''" . (($field["null"] ? isset($value) : strlen($value)) || isset($_GET["select"]) ? '' : ' checked="checked"') . '>' . ($field["null"] ? '<em>NULL</em>' : '') . '</label>';
+			echo " <label><input type='radio' name='fields[$name]' value=''" . (($field["null"] ? isset($value) : strlen($value)) || isset($_GET["select"]) ? '' : ' checked') . '>' . ($field["null"] ? '<em>NULL</em>' : '') . '</label>';
 		}
 		if (!isset($_GET["default"])) {
-			echo "<input type='radio' name='fields[$name]' value='0'" . ($value === 0 ? ' checked="checked"' : '') . '>';
+			echo "<input type='radio' name='fields[$name]' value='0'" . ($value === 0 ? ' checked' : '') . '>';
 		}
 		preg_match_all("~'((?:[^']+|'')*)'~", $field["length"], $matches);
 		foreach ($matches[1] as $i => $val) {
 			$val = stripcslashes(str_replace("''", "'", $val));
 			$checked = (is_int($value) ? $value == $i+1 : $value === $val);
-			echo " <label><input type='radio' name='fields[$name]' value='" . (isset($_GET["default"]) ? (strlen($val) ? h($val) : " ") : $i+1) . "'" . ($checked ? ' checked="checked"' : '') . '>' . h($val) . '</label>';
+			echo " <label><input type='radio' name='fields[$name]' value='" . (isset($_GET["default"]) ? (strlen($val) ? h($val) : " ") : $i+1) . "'" . ($checked ? ' checked' : '') . '>' . h($val) . '</label>';
 		}
 	} else {
 		$functions = (isset($_GET["select"]) ? array("orig" => lang('original')) : array()) + $adminer->editFunctions($field);
@@ -319,7 +319,7 @@ function input($field, $value, $function) {
 			foreach ($matches[1] as $i => $val) {
 				$val = stripcslashes(str_replace("''", "'", $val));
 				$checked = (is_int($value) ? ($value >> $i) & 1 : in_array($val, explode(",", $value), true));
-				echo " <label><input type='checkbox' name='fields[$name][$i]' value='" . (isset($_GET["default"]) ? h($val) : 1 << $i) . "'" . ($checked ? ' checked="checked"' : '') . "$onchange>" . h($val) . '</label>';
+				echo " <label><input type='checkbox' name='fields[$name][$i]' value='" . (isset($_GET["default"]) ? h($val) : 1 << $i) . "'" . ($checked ? ' checked' : '') . "$onchange>" . h($val) . '</label>';
 			}
 		} elseif (strpos($field["type"], "text") !== false) {
 			echo "<textarea name='fields[$name]' cols='50' rows='12'$onchange>" . h($value) . '</textarea>';
diff --git a/adminer/include/lang.inc.php b/adminer/include/lang.inc.php
index cd03fd40..57a36cc2 100644
--- a/adminer/include/lang.inc.php
+++ b/adminer/include/lang.inc.php
@@ -33,7 +33,7 @@ function switch_lang() {
 	hidden_fields($_GET, array('lang'));
 	echo lang('Language') . ": <select name='lang' onchange='this.form.submit();'>";
 	foreach ($langs as $lang => $val) {
-		echo "<option value='$lang'" . ($LANG == $lang ? " selected='selected'" : "") . ">$val";
+		echo "<option value='$lang'" . ($LANG == $lang ? " selected" : "") . ">$val";
 	}
 	echo "</select>\n<noscript><div style='display: inline;'><input type='submit' value='" . lang('Use') . "'></div></noscript>\n</div>\n</form>\n";
 }
diff --git a/adminer/sql.inc.php b/adminer/sql.inc.php
index a165fb02..c1ec4267 100644
--- a/adminer/sql.inc.php
+++ b/adminer/sql.inc.php
@@ -80,7 +80,7 @@ if (!$error && $_POST) {
 <p>
 <input type="hidden" name="token" value="<?php echo $token; ?>">
 <input type="submit" value="<?php echo lang('Execute'); ?>">
-<label><input type="checkbox" name="error_stops" value="1"<?php echo ($_POST["error_stops"] ? " checked='checked'" : ""); ?>><?php echo lang('Stop on error'); ?></label>
+<label><input type="checkbox" name="error_stops" value="1"<?php echo ($_POST["error_stops"] ? " checked" : ""); ?>><?php echo lang('Stop on error'); ?></label>
 
 <p>
 <?php
diff --git a/adminer/user.inc.php b/adminer/user.inc.php
index bee1649f..7984344f 100644
--- a/adminer/user.inc.php
+++ b/adminer/user.inc.php
@@ -133,7 +133,7 @@ if ($_POST) {
 <table cellspacing="0">
 <tr><th><?php echo lang('Username'); ?><td><input name="user" maxlength="16" value="<?php echo h($row["user"]); ?>">
 <tr><th><?php echo lang('Server'); ?><td><input name="host" maxlength="60" value="<?php echo h($row["host"]); ?>">
-<tr><th><?php echo lang('Password'); ?><td><input id="pass" name="pass" value="<?php echo h($row["pass"]); ?>"><?php if (!$row["hashed"]) { ?><script type="text/javascript">document.getElementById('pass').type = 'password';</script><?php } ?> <label><input type="checkbox" name="hashed" value="1"<?php if ($row["hashed"]) { ?> checked="checked"<?php } ?> onclick="this.form['pass'].type = (this.checked ? 'text' : 'password');"><?php echo lang('Hashed'); ?></label>
+<tr><th><?php echo lang('Password'); ?><td><input id="pass" name="pass" value="<?php echo h($row["pass"]); ?>"><?php if (!$row["hashed"]) { ?><script type="text/javascript">document.getElementById('pass').type = 'password';</script><?php } ?> <label><input type="checkbox" name="hashed" value="1"<?php if ($row["hashed"]) { ?> checked<?php } ?> onclick="this.form['pass'].type = (this.checked ? 'text' : 'password');"><?php echo lang('Hashed'); ?></label>
 </table>
 
 <?php
@@ -163,9 +163,9 @@ foreach (array(
 			if ($context == "Server Admin" && $object != (isset($grants["*.*"]) ? "*.*" : "")) {
 				echo "<td>&nbsp;";
 			} elseif (isset($_GET["grant"])) {
-				echo "<td><select name=$name><option><option value='1'" . ($value ? " selected='selected'" : "") . ">" . lang('Grant') . "<option value='0'" . ($value == "0" ? " selected='selected'" : "") . ">" . lang('Revoke') . "</select>";
+				echo "<td><select name=$name><option><option value='1'" . ($value ? " selected" : "") . ">" . lang('Grant') . "<option value='0'" . ($value == "0" ? " selected" : "") . ">" . lang('Revoke') . "</select>";
 			} else {
-				echo "<td align='center'><input type='checkbox' name=$name value='1'" . ($value ? " checked='checked'" : "") . ($privilege == "All privileges" ? " id='grants-$i-all'" : ($privilege == "Grant option" ? "" : " onclick=\"if (this.checked) form_uncheck('grants-$i-all');\"")) . ">"; //! uncheck all except grant if all is checked
+				echo "<td align='center'><input type='checkbox' name=$name value='1'" . ($value ? " checked" : "") . ($privilege == "All privileges" ? " id='grants-$i-all'" : ($privilege == "Grant option" ? "" : " onclick=\"if (this.checked) form_uncheck('grants-$i-all');\"")) . ">"; //! uncheck all except grant if all is checked
 			}
 			$i++;
 		}
diff --git a/editor/include/adminer.inc.php b/editor/include/adminer.inc.php
index 28f0acef..6b3454c5 100644
--- a/editor/include/adminer.inc.php
+++ b/editor/include/adminer.inc.php
@@ -310,7 +310,7 @@ ORDER BY ORDINAL_POSITION"); //! requires MySQL 5
 			}
 		}
 		if ($field["full_type"] == "tinyint(1)") { // bool
-			return '<input type="checkbox" value="' . h($value ? $value : 1) . '"' . ($value ? ' checked="checked"' : '') . "$attrs>";
+			return '<input type="checkbox" value="' . h($value ? $value : 1) . '"' . ($value ? ' checked' : '') . "$attrs>";
 		}
 		return '';
 	}