Does the presence of unexpected HTML in a Canvas quiz essay question answer indicate content was pasted – meaning plagiarized?

This can be seen using a browser inspectors

• https://developer.mozilla.org/en-US/docs/Learn/Common_questions/Tools_and_setup/What_are_browser_dev…
• https://developer.chrome.com/docs/devtools/
• https://www.microsoft.com/en-us/edge/learning-center/how-to-inspect-elements?form=MA13I2
• https://developer.apple.com/safari/tools/

Some HTML is expected, for example using Canvas to organize or emphasize text and pasting content from an IDE used in the course.

However, in many cases, content is pasted and edited.

Indications that an answer includes pasted content:

• Font differences – size, font family, weight, color
• Background colors
• Gaps and awkward spacing – for example

 "this    is some   editedtext"