This hidden formatting can easily be removed before pasting the text on to a web page by using Paste as Text mode.
Copy the text
Copy your text from any program (e.g., MS Word, Google Docs, email message), to your computer’s clipboard (memory) by highlighting the text and clicking the Copy button or Ctrl/C on your keyboard.

Open the page in Cascade CMS
In Cascade CMS, open the web page you wish to edit, and go to edit mode or hover over the content area and click Edit Content to open the in-context editor.

Select the Paste Plain Text option
In the Content editor, click Edit in the drop menu, and select Paste as text.

Note the blue alert box and close it by clicking the “x” in the right corner.

Paste
Insert the cursor in the location where you want the text and, Select Edit from the menu, then Paste. Or use the keyboard shortcut, Ctrl/V to insert your text.

Once the text has been inserted, format it as needed using the formatting tools in Cascade CMS.
Find more information about formatting text in the How do I… Tutorials.