Description from extension meta
Copy or paste source HTML of editable fields to/from clipboard
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Description from store
Editable HTML to clipboard is a Chrome browser extension that lets you copy the HTML contents of rich text fields to the clipboard, so you can edit them with your favorite code editor, then paste them back into the rich text input.
This is particularly useful when writing email, e.g. in Gmail, Yahoo Mail, Outlook…
The copy HTML source to clipboard and paste HTML source from clipboard options are available through a context menu (right click) and via keyboard shortcuts (Ctrl+. and Ctrl+Shift+.). These work only on rich text fields (technically: contenteditable HTML elements), and plain text multiline inputs (<textarea> HTML elements).