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🔸attribute

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🔰 JS ⟩ browser ⟩ DOM ⟩ types ⟩ Element ⟩ attribute

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attributes
- id
attributes vs. properties
data attributes

HTML attributes are not case sensitive, but JavaScript property names are.

HTML attributes are usually strings with exceptions:

when attribute is a boolean or numeric value.
elem.style is an object (CSSStyleDeclaration).
event handler attribute is function or null.

convert HTML attribute name to JS property name:

 HTML attribute        JS property
--------------------------------------------
data-first-name=""    elem.dataset.firstName  // "data-" attribute

exceptions

 HTML attribute    JS property
--------------------------------------------
 class=""          elem.className, elem.classList
 for=""            label.htmlFor
 value=""          input.defaultValue  // `input.value`: user's current input 
 --------------------------------------------

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Last updated 3 years ago