JQuery

One of the most common / famous old libraries
Simplifies common DOM operations
Supports very old browsers
Popularized using CSS Selectors in JavaScript
Helped browsers unify on standards

$("#my-list li")
    .css("color", "red")
    .text((i, old) => \`Item \${i + 1}.\${i + 1}\`)
    .append(
        $("<ul>").append(
            $("<li>", { class: "inner" })
                .text("inner")
                .hover(e => $(e.currentTarget).css("color", "green"))
        )
    )

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