How do I make an input element occupy all remaining horizontal space?

See: http://jsfiddle.net/thirtydot/rQ3xG/466/

This works in IE7+ and all modern browsers.

.formLine {
    overflow: hidden;
    background: #ccc;
}
.formLine input {
    width: 100%;
}
.formLine label {
    float: left;
}
.formLine span {
    display: block;
    overflow: hidden;
    padding: 0 5px;
}
.formLine button {
    float: right;
}
.formLine input, .formLine button {
    box-sizing: border-box;
}
<div class="formLine">
    <button>click me</button>
    <label>some text.. </label>
    <span><input type="text" /></span>
</div>

The button must go first in the HTML. Slightly distasteful, but c’est la vie.

The key step is using overflow: hidden;: why this is necessary is explained at:

The extra span around input is necessary because display:block; has no effect for input: What is it in the CSS/DOM that prevents an input box with display: block from expanding to the size of its container

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