Q:

Please set the editor tab size to 4

Markdown renders tabs as 4 spaces, but browsers traditionally render tabs using a width of 8, so they look like 8 spaces in the edit box. It is possible to override the display tab size using the relatively new CSS tab-size property. I'd like for that to be done so that the width of tabs in the edit box is the same as it is in the output.
https://developer.mozilla.org/en-US/docs/Web/CSS/tab-size
http://dev.w3.org/csswg/css-text-3/#tab-size-property

A:

Very nice, I honestly didn't know about tab-size. That's indeed a no-brainer. Added to the next build.

A:

Nice, if all major browsers support this, to avoid confusion when people switch browsers.
Unfortunately, Internet Explorer has no support, and Firefox needs the -moz prefix, so minitech once suggested the following:

Non-content-destroying fix to at least make indentation less of a guessing game:
.wmd-input {
    -moz-tab-size: 4;
      -o-tab-size: 4;
         tab-size: 4;
}

I think the -o prefix for Opera is no longer needed. For me, the above works fine for the latest Chrome, Firefox and Safari, but no cigar for Internet Explorer 11; see this JSFiddle:

I'd say: yes, please.

