Enabling Fractions/Cents/Decimals for Number Input

To allow fractions on an number input, you need to specify the step attribute to any:

<input type="number" min="1" step="any" />

This will specifically keep Chrome from displaying an error when a decimal/fractional currency is entered into the input. Mozilla, IE, etc... don't error out if you forget to specify step="any". W3C spec states that step="any" should, indeed, be needed to allow for decimals. So, you should definitely use it. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/number#step

Note that if you want the up/down buttons to do a specific granularity, then you must specify a numeric step such as ".01".

Also, the number input is now pretty widely supported (>90% of users).

What Input Options are there for Money/Currency?

The title of the question has since changed and takes on a slightly different meaning. One could use both number or text input in order to accept money/decimals.

For an input field for currency/money, it is recommended to use input type of number and specify appropriate attributes as outlined above. As of 2020, there is not a W3C spec for an actual input type of currency or money.

Main reason being it automatically coerces the users into entering a valid standard currency format and disallows any alphanumeric text. With that said, you could certainly use the regular text input and do some post processing to only grab the numeric/decimal value (there should be server side validation on this at some point as well).

The OP detailed a requirement of currency symbols and commas. If you want fancier logic/formatting like that, (as of 2020) you'll need to create custom JS logic for a text input or find a plugin.

Add step="0.01" to the <input type="number" /> parameters:

<input type="number" min="0.01" step="0.01" max="2500" value="25.67" />

Demo: http://jsfiddle.net/uzbjve2u/

But the Dollar sign must stay outside the textbox... every non-numeric or separator charachter will be cropped automatically.

Otherwise you could use a classic textbox, like described here.

Here's a workaround with an additional input type="text":

http://jsfiddle.net/UEVv6/2/

HTML

<input type="text" id="userinput" pattern="[0-9]*">
<br>
<input type="number" id="number">

JS

document.getElementById("userinput").onblur =function (){    

    //number-format the user input
    this.value = parseFloat(this.value.replace(/,/g, ""))
                    .toFixed(2)
                    .toString()
                    .replace(/\B(?=(\d{3})+(?!\d))/g, ",");

    //set the numeric value to a number input
    document.getElementById("number").value = this.value.replace(/,/g, "")

}

regex is from here How to print a number with commas as thousands separators in JavaScript

Consider simulating an input field with a fixed prefix or suffix using a span with a border around a borderless input field. Here's a basic kickoff example:

.currencyinput {
    border: 1px inset #ccc;
}
.currencyinput input {
    border: 0;
}

<span class="currencyinput">$<input type="text" name="currency"></span>