For many years (decades at this point), I've noticed that, at least in plaintext environments, "serious" and/or "old-timer" people seem to always type like this:

This is a sentence.  And here comes another one.  Shockingly, this is a third sentence, right after the first two.  And even a fourth!

I've always typed like this instead:

This is a sentence. And here comes another one. Shockingly, this is a third sentence, right after the first two. And even a fourth!

Comparing the two, I can easily see why the first one is done: it's way easier to read, and I'm annoyed by myself for not seeing it sooner. I'm heavily leaning toward starting to do this all the time now, but as you can tell, my fingers aren't naturally inclined to make two spaces after each sentence. Even though it looks much better, it doesn't feel more correct while inputting text. At least not for me.

(Now I'm going to really make an effort to do it.) You might counter with: "Well, you are just not used to it! It will soon feel natural!" That may be, but an obvious problem then arises whenever you are not typing in a "plaintext" environment, and it suddenly makes two spaces unnecessarily because the word processor or whatever already takes care of setting a little margin for each sentence. So then you have to switch back and forth between these different ways of typing, which is confusing.

I'm basically wondering where and when this started and if it's still recommended. I'm going to try to force myself to do it. I don't want the sentences to blend together for my readers.

It should be noted that if such a CSS property exists, I don't know what it's called. I can't recall seeing "automatic margin" in between sentences in HTML -- only at the beginning for a paragraph, like this:

<p>This is a demo.</p>

Rendered as:

  This is a demo. Here goes more text until a linebreak
and notice how this row is two spaces to the left of th
e first line, which has two spaces added before it begi
ns. However, this new sentence has only one space after
the dot, so go figure?

I'd really love for this to be cleared up once and for all!

For many years (decades at this point), I've noticed that, at least in plaintext environments, "serious" and/or "old-timer" people seem to always type like this:

This is a sentence.  And here comes another one.  Shockingly, this is a third sentence, right after the first two.  And even a fourth!

I've always typed like this instead:

This is a sentence. And here comes another one. Shockingly, this is a third sentence, right after the first two. And even a fourth!

Comparing the two, I can easily see why the first one is done: it's way easier to read, and I'm annoyed by myself for not seeing it sooner. I'm heavily leaning toward starting to do this all the time now, but as you can tell, my fingers aren't naturally inclined to make two spaces after each sentence. Even though it looks much better, it doesn't feel more correct while inputting text. At least not for me.

(Now I'm going to really make an effort to do it.) You might counter with: "Well, you are just not used to it! It will soon feel natural!" That may be, but an obvious problem then arises whenever you are not typing in a "plaintext" environment, and it suddenly makes two spaces unnecessarily because the word processor or whatever already takes care of setting a little margin for each sentence. So then you have to switch back and forth between these different ways of typing, which is confusing.

I'm basically wondering where and when this started and if it's still recommended. I'm going to try to force myself to do it. I don't want the sentences to blend together for my readers.

It should be noted that if such a CSS property exists, I don't know what it's called. I can't recall seeing "automatic margin" in between sentences in HTML -- only at the beginning for a paragraph, like this:

<p>This is a demo.</p>

Rendered as:

  This is a demo. Here goes more text until a linebreak
and notice how this row is two spaces to the left of th
e first line, which has two spaces added before it begi
ns. However, this new sentence has only one space after
the dot, so go figure?

I'd really love for this to be cleared up once and for all!