If you're talking about per-text size changes, there's some basic things you can do.

For large text, you can use a # before the text.

#Hello_World goes to #Hello_World

It needs to be on its own line.

The small text you see in Oli's answer was produced by putting <sup></sup> or <sub></sub> around the text.

<sup>I know, I know. You **can't** post comments yet.</sup>

to

^{I know, I know. You can't post comments yet.}

I don't know if there are other text size options, but according to this Meta SE Q&A, there don't seem to be any more options.

Edit:

Thanks to Videonauth, I can now say that using some basic HTML tags will work, such as <h1></h1>, h2, etc. I think these will display differently on different browsers, depending on whether or not AU/SE has them customized in the CSS.

If you're talking about per-text size changes, there's some basic things you can do.

For large text, you can use a # before the text.

#Hello_World goes to

Hello_World

It needs to be on its own line.

The small text you see in Oli's answer was produced by putting <sup></sup> or <sub></sub> around the text.

<sup>I know, I know. You **can't** post comments yet.</sup>

to

^{I know, I know. You can't post comments yet.}

I don't know if there are other text size options, but according to this Meta SE Q&A, there don't seem to be any more options.

Edit:

Thanks to Videonauth, I can now say that using some basic HTML tags will work, such as <h1></h1>, h2, etc. I think these will display differently on different browsers, depending on whether or not AU/SE has them customized in the CSS.

If you're talking about per-text size changes, there's some basic things you can do.

For large text, you can use a # before the text.

#Hello_World goes to #Hello_World

It needs to be on its own line.

The small text you see in Oli's answer was produced by putting <sup></sup> or <sub></sub> around the text.

<sup>I know, I know. You **can't** post comments yet.</sup>

to

^{I know, I know. You can't post comments yet.}

I don't know if there are other text size options, but according to this Meta SE Q&A, there don't seem to be any more options.

Edit:

Thanks to Videonauth, I can now say that using some basic HTML tags will work, such as <h1></h1>, h2, etc. I think these will display differently on different browsers, depending on whether or not AU/SE has them customized in the CSS.

If you're talking about per-text size changes, there's some basic things you can do.

For large text, you can use a # before the text.

#Hello_World goes to #Hello_World

It needs to be on its own line.

The small text you see in Oli's answer was produced by putting <sup></sup> or <sub></sub> around the text.

<sup>I know, I know. You **can't** post comments yet.</sup>

to

^{I know, I know. You can't post comments yet.}

I don't know if there are other text size options, but according to this Meta SE Q&A, there don't seem to be any more options.

Edit:

Thanks to Videonauth, I can now say that using some basic HTML tags will work, such as <h1></h1>, h2, etc. I think these will display differently on different browsers, depending on whether or not AU/SE has them customized in the CSS.

If you're talking about per-text size changes, there's some basic things you can do.

For large text, you can use a # before the text.

#Hello_World goes to #Hello_World

It needs to be on its own line.

The small text you see in Oli's answer was produced by putting <sup></sup> or <sub></sub> around the text.

<sup>I know, I know. You **can't** post comments yet.</sup>

to

^{I know, I know. You can't post comments yet.}

I don't know if there are other text size options, but according to this Meta SE Q&A, there don't seem to be any more options.

If you're talking about per-text size changes, there's some basic things you can do.

For large text, you can use a # before the text.

#Hello_World goes to #Hello_World

It needs to be on its own line.

The small text you see in Oli's answer was produced by putting <sup></sup> or <sub></sub> around the text.

<sup>I know, I know. You **can't** post comments yet.</sup>

to

^{I know, I know. You can't post comments yet.}

I don't know if there are other text size options, but according to this Meta SE Q&A, there don't seem to be any more options.

Edit:

Thanks to Videonauth, I can now say that using some basic HTML tags will work, such as <h1></h1>, h2, etc. I think these will display differently on different browsers, depending on whether or not AU/SE has them customized in the CSS.