Html5 Number Input - Always show 2 decimal places

HTML setup: Placeholder power 💪

The step attribute and placeholder can suggest the format, but they are only suggestions.

<!-- Setting up a visual cue with placeholder -->
<input type="number" id="num" placeholder="0.00" step="0.01">
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Remember - placeholders are just hints, not enforcers.

JavaScript: Enforcing formatting like a boss 😎

Let's ramp things up with JavaScript. This script ensures 2 decimal places upon input field blur.

<!--
  This JavaScript walks into a bar. 
  See a potential problem to fix,
  It says, "Don't worry HTML5, I got this!"
-->
document.querySelector('#num').addEventListener('blur', function() {
	this.value = parseFloat(this.value).toFixed(2);
});
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Here, JavaScript is the reliable wingman HTML5 needed!

jQuery: Bending the front-end to your will 🎩

jQuery's Mask Plugin by Igor Escobar is a fantastic tool for dynamic field formatting, but remember it's only skin-deep. You still need robust server-side validation.

<!--
   Using a mask to trick the input into thinking it's a cat. 
   Cheers Igor, you are a legend! 🐾
-->
$('#num').mask('000,000,000.00', { reverse: true });
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Browser compatibility: It's a jungle out there 🌴

Each browser has its own quirks with the number input type. Taking time to test across various browsers saves nerve cells later.

Accessibility: Because everyone matters ❤️

Accessibility is not merely a buzzword; it's a responsibility. Screen readers should interpret formatted inputs accurately and keyboard navigation should be seamless.

Alternative methods: A text input in number's clothing 🕵️‍♂️

For those seeking high control over formatting, you might find a text input with regex pattern more suitable. But remember, it's trade-off time: convenience versus control.

<!-- A strict bouncer at the club of inputs. -->
<input type="text" pattern="\d+(\.\d{2})?" title="This should be a number with up to two decimal places.">
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Form data integrity: Trust but verify 🕵️

Whether you're using HTML attributes or JavaScript, validation on the server-side is a must. It's your safety net in the exciting yet daunting trapeze act of web development.

HTML or JavaScript: Convenience vs Precision 🎭

It's the classic stand-off between user convenience and data precision. By judiciously blending HTML attributes with JavaScript or jQuery, you can maintain a user-friendly UI without sacrificing data accuracy.