Html Details - What Are They?

[GSD4ME]

Something that has got me stumped in HTML - not the actual display or anything but the syntactic and semantic meaning of something.
I needed to analyse some HTML - which I understand and have various books on the subject - but none of them list these 'extras' that I am seeing or explain what they are.Internet searches haven't come up with anything either (yet!)
In the HTML I am looking at, nearly every close tag is followed by an 'at' sign and a list of numbers, separated by a dot character - for example @0.1.4.1.2.0.0.0.0.0.
Can someone please explain what they are, what they mean, what interpretation they imply and anything else applicable to them. Many thanks

[fernandamilani]

If this is a downloaded site, then it may be a mistake and these characters were accidentally added to the program code. Usually in incomprehensible situations with my site I turn to Innovets professionals https://innovecs.com/ to solve problems most quickly.

[brendagray]

It's possible that these additional characters and numbers are specific to the particular HTML code you are analyzing and may be used for internal purposes by the website or application. They could be part of a custom markup or naming convention used by the developer or a specific framework or library employed in the project.

Without further context or knowledge of the specific codebase you are examining, it is challenging to determine their exact purpose or interpretation.

If you encounter any non-standard elements or syntax in HTML, it's crucial to refer to the original source code, documentation, or the developer who wrote the code to understand their intended use.

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