Why do we use the word an on the word "html"?
There seems to be a misconception as we typically do not use the word "an" before the word "HTML." The word "HTML" is commonly pronounced with the individual letters pronounced: "aych-tee-em-el." Since the letter "H" is pronounced with a consonant sound, we should use "a" instead of "an".
The usage of "a" or "an" depends on the sound that follows it, not the actual letters. Generally, "a" is used before words starting with a consonant sound, while "an" is used before words starting with a vowel sound. In the case of "HTML," the "aych" sound at the beginning makes it appropriate to use "a".