Steps to Reproduce

1. Log in to Confluence using Chrome
2. Go to > General Configuration > Colour Scheme
3. Click Edit
4. Change the Heading Text to #FF0000 (Red)
5. Save the changes
6. Create a test page with the following content format
   Source Editor

   <p>test content</p>
   <h2>test heading</h2>
   <p>new line</p>
   

7. Save the page
8. Edit again
9. Hit delete key to remove the <h2>

Observed Behaviour

The editor is keeping the custom colour by adding a <span> tag

<p>test content<span style="color: rgb(255,0,0);">test heading</span>
</p>
<p>new line</p>

Expected Behaviour

No <span> like the following

<p>test contenttest heading</p>
<p>new line</p>

Workaround

• Use other supported browsers (e.g Firefox)
• Reset custom heading back to the default
  • Go to > General Configuration > Colour Scheme > Reset
• Manually clear the text format by selecting the text in editor > More > Clear formatting