First I don't know almost anything about HTML.
I have .txt file that looks like this
and I want to edit this page http://elektro-srb.webs.com/high-score so that it shows content of this file. File will update from time to time.
"_" is actually space in file but because of some strange formatting here I changed it.
I need as simple solution as it can be.
You can't do it with HTML. HTML is a markup language, you can't include a dynamic text in it.
You can use iframe and load the .txt file as a source, but note that this is not a vaild HTML format.
<iframe src="your_file.txt" />
If you're using s server side language you can load the .txt content. For example in php:
<?php echo file_get_contents("your_file.txt"); ?>