[css] Specify multiple attribute selectors in CSS

What is the syntax for doing something like:

input[name="Sex" AND value="M"]

Basically, I want to select the input element that has the attribute name="Sex" as well as the attribute value="M":

<input type="radio" name="Sex" value="M" />

Elements such as the following should not be selected:

<input type="radio" name="Sex" value="F" />

For concatenating it's:

input[name="Sex"][value="M"] {}

And for taking union it's:

input[name="Sex"], input[value="M"] {}

[class*="test"],[class="second"] {
background: #ffff00;
}

Concatenate the attribute selectors:

input[name="Sex"][value="M"]

Just to add that there should be no space between the selector and the opening bracket.

td[someclass] 

will work. But

td [someclass] 

will not.