``Is there a faux pseudo element lurking within Firefox?"

I have a question regarding Firefox. I often notice some peculiar pseudo elements in the debugger tool, displayed as a rectangle with a dot inside:

In this particular case, I cannot fathom why there would be a pseudo element in the middle of a list.

Whenever I inspect this type of element in the debugger, I am unable to find any CSS rule applied to it. There are no visible rules in the previous or next elements that could explain its presence. When I hover over it in the debugger, it shows up as an element measuring 3x18 px:

The existence of such elements at seemingly random locations puzzles me. In the Firefox inspector, I come across many of these elements, each having its own unique size or rule.

As shown in the screenshot below, this element is absent in Chromium:

Could someone please explain what this symbol represents? It appears to be exclusive to Firefox.

Thank you

Update 1 : Upon further investigation, it seems unlikely that this symbol originates from my code. I simply opened the debugger on Stackoverflow and came across another example right here:

htmlcssfirefoxpseudo-element

Answer №1

After searching extensively, I was able to uncover the solution on my own.

I stumbled upon an intriguing blog post by Mozilla that shed light on why white spaces are represented with special characters in the debugger. Apparently, the placement of whitespaces like new lines or spaces in code can impact how the code is rendered at times. Hence, the debugger displays these special characters to indicate their presence.

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