In the Magento 1 days I'd just take the file from the core Magento files and comment out the session clear function on the checkout page allowing our front end developers to refresh the page as they please without having to keep making new orders to test every new piece of CSS they wrote.
Is there any way to stop the checkout process from having to be done again and again to style the thank you page on Magento 2.1? I can't find anything when trying to Google the issue.
Best Answer
You can find out it in magento-2 from given file
Just comment out this line :
$session->clearQuote();