This page lists features of JavaScript that are deprecated (that is, still available but planned for removal) and obsolete (that is, no longer usable).

The transform-origin SVG attribute sets the origin for an item's transformations.

The slope attribute indicates the vertical stroke angle of a font.

The void operator evaluates the given expression and then returns undefined.

The const declaration declares block-scoped local variables. The value of a constant can't be changed through reassignment using the assignment operator, but if a constant is an object, its properties can be added, updated, or removed.

The transform attribute defines a list of transform definitions that are applied to an element and the element's children.

The ry attribute defines a radius on the y-axis.

The class declaration creates a binding of a new class to a given name.

The crossorigin attribute, valid on the <image> and <feImage> elements, provides support for configuration of the Cross-Origin Resource Sharing (CORS) requests for the element's fetched data.

The text-anchor attribute is used to align (start-, middle- or end-alignment) a string of pre-formatted text or auto-wrapped text where the wrapping area is determined from the inline-size property relative to a given point.