CSS Font Visibility Changes

This is just strange but for now we’ve alter some css regarding font visibilty.Could you please review screenshot and video url?
Correct above sentence

Here’s a corrected version of your sentence:

"This is a bit unusual, but for now, we've made some CSS changes related to font visibility. Could you please review the screenshot and the video URL?"

There is no harm to keep development mode on because ,But We will need to look on this.But till now we are not seeing any negative effect
Correct above sentence

"There is no harm in keeping development mode on for now, as we haven't observed any negative effects. However, we will need to monitor this closely."