The Object.defineProperty() static method defines a new property directly on an object, or modifies an existing property on an object, and returns the object.

As an XML dialect, SVG is namespaced. It is important to understand the concept of namespaces and how they are used if you plan to author SVG content. Namespaces are essential to user agents that support multiple XML dialects; browsers must be very strict. Taking the time to understand namespaces now will save you from future headaches.

The xChannelSelector attribute indicates which color channel from in2 to use to displace the pixels in in along the x-axis.

The y2 attribute is used to specify the second y-coordinate for drawing an SVG element that requires more than one coordinate. Elements that only need one coordinate use the y attribute instead.

The JavaScript exception "invalid Array.prototype.sort argument" occurs when the argument of Array.prototype.sort() isn't either undefined or a function which compares its operands.

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

The SVG styling attributes are all the attributes that can be specified on any SVG element to apply CSS styling effects.

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The addition assignment (+=) operator performs addition (which is either numeric addition or string concatenation) on the two operands and assigns the result to the left operand.

The accent-height attribute defines the distance from the origin to the top of accent characters, measured by a distance within the font coordinate system.