Python idle not doing anything when i press return key

You are almost finished updating a web site. as part of the update, you have converted all pages from html 4.0 to html5. the project is currently on schedule. however, your project manager has been asked by the marketing team manager to justify a day of time spent validating the site's html5 pages. the marketing team manager does not have technical knowledge of the internet or the web. which is the most appropriate explanation to provide to the marketing team manager?

If you want to delete an entire word at a time, which key should you press along with the backspace or delete key?

To remove text from a specific location and keep it to use again, you should select