The <feBlend> SVG filter primitive composes two objects together ruled by a certain blending mode. This is similar to what is known from image editing software when blending two layers. The mode is defined by the mode attribute.

The <font-face-src> SVG element corresponds to the src descriptor in CSS @font-face rules. It serves as container for <font-face-name>, pointing to locally installed copies of this font, and <font-face-uri>, utilizing remotely defined fonts.

The await operator is used to wait for a Promise and get its fulfillment value. It can only be used inside an async function or at the top level of a module.

The <feImage> SVG filter primitive fetches image data from an external source and provides the pixel data as output (meaning if the external source is an SVG image, it is rasterized.)

The v-ideographic attribute indicates the alignment coordinate for glyphs to achieve ideographic baseline alignment for vertically oriented glyph layouts. The value is an offset in the font coordinate system relative to the glyph-specific vert-origin-x attribute.

The xlink:type attribute identifies the type of XLink being used. In SVG, only simple links are available.

The type attribute is a generic attribute and it has different meaning based on the context in which it's used.

The JavaScript exception "radix must be an integer at least 2 and no greater than 36" occurs when the optional radix parameter of the Number.prototype.toString() or the BigInt.prototype.toString() method was specified and is not between 2 and 36.

The JavaScript exception "missing ] after element list" occurs when there is an error with the array initializer syntax somewhere. Likely there is a closing square bracket (]) or a comma (,) missing.

The underline-position attribute represents the ideal vertical position of the underline. The underline position is expressed in the font's coordinate system.