The JavaScript exception "missing variable name" is a common error. It is usually caused by omitting a variable name or a typographic error.

The startOffset attribute defines an offset from the start of the path for the initial current text position along the path after converting the path to the <textPath> element's coordinate system.

Whereas HTML defines a webpage's structure and content and CSS sets the formatting and appearance, JavaScript adds interactivity to a webpage and creates rich web applications.

The u2 attribute specifies list of Unicode characters (refer to the description of the unicode attribute of the <glyph> element for a description of how to express individual Unicode characters) and/or ranges of Unicode characters, which identify a set of possible second glyph in a kerning pair.

The v-mathematical attribute indicates the alignment coordinate for glyphs to achieve mathematical 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.

SVG images can be used as an image format, in a number of contexts. Browsers support SVG images in:

The to attribute indicates the final value of the attribute that will be modified during the animation.

The x attribute defines an x-axis coordinate in the user coordinate system.

SVG elements can be modified using attributes that specify details about exactly how the element should be handled or rendered.

The mathematical attribute indicates the alignment coordinate for glyphs to achieve mathematical baseline alignment for horizontally oriented glyph layouts. The value is an offset in the font coordinate system.