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What are the semantics in html?

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From: Date: Jul 8, 2020 4:26PM

Hello everyone,

Before actual diving into aria and wcag2.1 I understood that it is
important for me to betterunderstand html.

I found the course from mozilla web developer (mdn) about it, it is
really clear to read it and I learned really a lot of important
information that i haven't known about html before but , however, i have
some questions.

What are the semantics in html?

I tried to understand the description from here:

https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/HTML_text_fundamentals

but it is still not clear, maybe because of the language barrier :).

I couldn't understand what the semantics are, what they are needed for
and how they are applied to a screen reader and be used for
accessibility tasks.

I thought that they are the same things as elements such as a heading
from level 1 to 6, but it seems like it is not like that.

So, can somebody explain that please?

Thank you in advance!

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Best wishes,

Vsevolod