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:
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.