$realAttrs = array(
'type' => 'search',
'name' => 'search',
+ 'placeholder' => wfMessage( 'searchsuggest-search' )->text(),
'value' => isset( $this->data['search'] ) ? $this->data['search'] : '',
);
$realAttrs = array_merge( $realAttrs, Linker::tooltipAndAccesskeyAttribs( 'search' ), $attrs );