Web Reference: Jun 22, 2009 · It's always better to handle these kinds of stuff using CSS first, in general, if you can solve something using CSS, go for that first, then try JavaScript to solve your problems, so in this case try using :first-letter in CSS and apply text-transform:capitalize; Jul 11, 2025 · The charAt () with slice () method is the simplest and most commonly used way to capitalize the first letter of a string. replace () with regular expressions offers a powerful alternative, especially for advanced use cases. Convert to uppercase: let text = "Hello World!"; The toUpperCase() method converts a string to uppercase letters. The toUpperCase() method does not change the original string. The string converted to uppercase. toUpperCase() is an ECMAScript1 (JavaScript 1997) feature. It is supported in all browsers:
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