searchform.php

<?php $search_box_default = __( 'Search...', 'it-l10n-BuilderChild-Default' ); ?>

<?php $search_box_value = esc_attr( apply_filters( 'the_search_query', get_search_query() ) ); ?>

<?php $search_box_value = ( empty( $search_box_value ) ) ? $search_box_default : $search_box_value; ?>

<form method="get" class="search-form" action="<?php echo get_option( 'home' ); ?>">
    <input type="text" value="<?php echo $search_box_value; ?>" name="s" class="search-text-box" onfocus="if(this.value == '<?php echo $search_box_default; ?>') this.value = '';" onblur="if(this.value == '') this.value = '<?php echo $search_box_default; ?>';" />
    <input type="submit" value="<?php echo esc_attr__( 'Search', 'it-l10n-BuilderChild-Default' ); ?>" class="search-submit-button" />
</form>