Obviously, you will not get an answer specific to your situation, because you did not supply any HTML code. However, a very common problem with HTML not displaying properly is missing or malformed tags. If you have a <b> tag with out a </b> tag, all text after the <b> will be in bold, even if that was not your intent.
HTML when contains error won't work on the browsers. It can happen when a tag is not closed correctly.
You can work on HTML in Notepad or Notepad++. These are text editors which understand HTML.
NO HTML does not work in PowerPoint. Power Point is for making slide shows and HTML is a web programming language.
HTML cannot work without it's tags. It uses tags for it's scripting work.
The people not into web-designing do not need HTML to work. Only web designers are in the need of that.
No. HTTP is HyperText Transfer Protocol, which is the protocol that web pages work on. HTML needs HTTP for it to work. HTTP is not code for a web page; it is not HTML.
It doesn't
I don't think you can use HTML to remove HTML, you can hide HTML commands with <!-- TEXT OR SCRITPS HERE --> Any scripts between the <!-- AND --> wont show up on the HTML document. using those are good for leaving reminds like where a form starts and stops or to place something there that you might use later.
Javascript can change how HTML will work, alike how CSS makes HTML look flashy.
HTML uses tags for its complete functionality. These tags are defined to do a certain work.
Yes however not all html tags will work.
No HTML can be written in a simple text file and saved as .html.