As an example, imagine I have a table. The standard alignment behaviour (not sure if this is html specification or just the browsers I use?) seems to be to left align the body elements and center align the head elements.

So if I wanted everything left aligned, is it less efficient to write

```
#MyTable td {
    text-align: left;
}

```

than to write

```
#MyTable tbody td {
    text-align: left;
}

```

Or does it not really make any difference?

What is best practice in this situation?

I guess my question is really about how "default" styles get set. Are they actually explicitly set by the browser if no matching style if found in the css? Or are they genuine default behaviours when no style is present.