Em Space  

The Em Space character ( ) is a standard HTML entity defined in the HTML specification. In HTML source code, it can be written using the named entity reference  , the decimal numeric character reference  , or the hexadecimal numeric reference  . The character is assigned Unicode code point U+2003 in the Universal Character Set.

The em space is a typographic space character whose width equals one em — the point size of the current font. It is the widest standard typographic space and roughly equals the width of the letter 'M'. The em space is a fundamental unit of measurement in typography and desktop publishing.

Punctuation and whitespace entities are among the most frequently used HTML entities in web development. They handle characters that either have special meaning in HTML syntax — such as angle brackets and ampersands — or represent typographic characters that improve the visual quality of text, like em dashes and curly quotes. Proper use of punctuation entities is essential for producing valid, well-formed HTML documents and achieving professional-looking typography on the web.

When deciding how to encode the Em Space character in your HTML documents, the named entity   is generally the most readable choice for developers reviewing or maintaining source code. The decimal form   and hexadecimal form   are equally valid alternatives that work in contexts where named entities may not be supported, or when generating HTML output programmatically from server-side code. All three representations produce identical visual output in every modern web browser.

Use the em space for paragraph indentation in contexts where CSS text-indent cannot be applied, or for creating wide separations between inline elements. It is commonly used in published text and email formatting where CSS support is limited or unreliable.