How to type superscript and subscript in Blogger?

Blogger is an excellent platform to express your views and explain something. For simple writing, it has many tools like Microsoft word document but not all of it. One of such lacking feature is superscript and subscript. While in the Microsoft word you can switch to these two styles with a simple click of a button in the upper toolbar, here in the Blogger you have limited choice. What do you do here? ----

1. you click a button resembling an emoji - smiley.

Click this button to open a small window for special characters

2. It opens a small window where you find a lot of special characters. You search them either by typing or by drawing a shape.

A limited number of characters in the superscript/subscript

3. For superscript - type "superscript" in the search box of this small window and you will see a list of superscript characters. You will see digits and some alphabets. If the desired character is here, click it and it will appear on the "edit blog post" at the place where the cursor is.

4. The same is the process for subscript.

So far so good but there are many characters that you want to write as superscript or subscript but can not find them here. It will be a problem if you want to explain something in mathematics or physics. Not only characters but sometimes we need to write a word or a short sentence as superscript or subscript. For this, you have to know some hacks that I will explain to you here.

See below the title of your blog on the desktop. There are two buttons "compose" and "HTML" side by side. (Edit: in the new format of the blogger, you will see these two buttons on a dropdown list when clicked on a pencil icon on leftmost side of the editing toolbar) By default, the edit page in the blog opens in Compose mode where we compose our blog. It is easier to type here and see how our blog should be. But it is the simplified version for the users because the real language that computer understands is something else that appears in the HTML button mode. Whatever we type is converted by some software in a language that the computer understands. It looks like junk to us. You can easily see this by clicking the HTML button. But this button showing the HTML version is very useful to do things that are very difficult in Compose mode.

As we need to write some letters, words, or sentences as superscript or subscript, first type it as usual in Compose mode. Now go to the HTML mode and search for those typed words. This searching is the most difficult part of our job because you will notice more special characters and parentheses than your literature. But with some labor, you can search for it as the literature will be arranged at the same place. You mentally mark the portion that you want as superscript or subscript. For the superscript type just before that portion and type just after that portion. These are called tags. Similarly for the subscript type just before that portion and type just after that portion. These should be done exactly as said because these words say to the computer from where to start superscript/subscript and where to end. Any deviation or difference in typing these words will result in an error. Once you do it click the Compose button. You will find the desired result appearing here in the post.
For example, I type Pexternal. I want "external" as superscript. Under the HTML button, I search for Pexternal.↓