What's wrong
An input button with empty `value=""` has no readable label for assistive technologies.
Who it affects
Screen reader users cannot tell what action submitting the form will trigger.
How to fix on WordPress
Provide a translated `value="<?php esc_attr_e( 'Place order', 'woocommerce' ); ?>"`.
Code example
Problematic Code
PHP
<input type="submit" value="">Recommended Accessible Code
PHP
<input type="submit" value="<?php esc_attr_e( 'Apply coupon', 'woocommerce' ); ?>" class="button">How to check your fix
Verify `value` attribute is non-empty and describes the submission result.