HTML Attributes

The global id attribute uniquely identifies an element within a document.

The global class attribute, used for CSS styling and for querySelector selection.

The global style attribute for inline CSS directly on an element.

The global lang attribute marks the language of text, important for screen readers and translators.

The global boolean hidden attribute hides an element from both sighted users and screen readers.

The global tabindex attribute controls Tab-key sequence and whether an element is focusable.

The href attribute of a and link elements: the URL a link or resource points to.

The src attribute of img, script, video, audio, iframe: the URL of a resource to load.

The alt attribute of img: a required text description for accessibility and fallback.

The type attribute for input (text/number/checkbox etc.), button, and script (script type).

The value attribute for input, option, li, progress, meter: the current or initial value.

The placeholder attribute for input and textarea: a hint that is not a substitute for a label.

The boolean required attribute for input, select, textarea: built-in HTML5 required-field validation.

The boolean disabled attribute for input, button, select, textarea, fieldset: inactive and excluded from form submission.

The target attribute of a and form: which browsing context (tab/frame) to open the result in.