Same code but position is different

Do you see the vertical position of “text” in http://dot.kr/x-test/upper.php is different from the vertical position of “text” in http://dot.kr/x-test/lower.php although they have same code?

Some strange kind of hidden character has crept into lower. Make sure to type your code in a plain text editor, rather than something like Word. If you clear away the spaces and then add in returns again, they are both the same:

<!doctype html>
<html>

<head>
    <meta charset="UTF-8">
    <title>upper</title>
  </head>

<body>


<p>text</p>

</body>

</html>

How can you see the strange kind of hidden character?
I can’t see any strange kind of hidden character through view-source.

I am using an Editor which is made by myself.
I guess the editor has some kind of bug.

If I can see the strange kind of hidden character, I might fix the Editor.

Ralph probably just used copy-and-paste of the source code and its clearly sitting there on Line: 11 - illegal character data.

Yes, even if you just view source and click on that line, the blinking cursor is much bigger, so clearly there’s something not right there. So I just deleted the white space and put in new line returns at whatever was there was cleared out.