Recommended that you "compose" in Word. It's much easier.

Select a monospaced font. Courier is most common.

start with a <pre> tag and end with a </pre> end tag.

Use spaces in the upper (chord line) to space the chords to match the verse. Within a "pre" tag, the html reader will not collapse spaces like it does in ordinary text.

Type the verse, with appropriate spacing, insert dashes "-" to separate syllables when there's a chord change on the syllable rather than the beginning of the word.

The pre tag forces the html reader to render "as typed." It should always use a monospaced font even if you typed it in a proportional one, so you need to type it in mono if you want to see how it will line up. That's easier to do in Word than in an input box.

Preview before hitting submit highly recommended.

<pre>
  D    G
  Down in the valley
  
  </pre>

John