The overflow attribute sets what to do when an element's content is too big to fit in its block formatting context. This feature is not widely implemented yet.

This attribute has the same parameter values and meaning as the CSS overflow property, however, the following additional points apply:

• If it has a value of visible, the attribute has no effect (i.e., a clipping rectangle is not created).
• If the overflow property has the value hidden or scroll, a clip of the exact size of the SVG viewport is applied.
• When scroll is specified on an <svg> element, a scrollbar or panner is normally shown for the SVG viewport whether or not any of its content is clipped.
• Within SVG content, the value auto implies that all rendered content for child elements must be visible, either through a scrolling mechanism, or by rendering with no clip.

You can use this attribute with the following SVG elements:

• <foreignObject>
• <iframe>
• <image>
• <marker>
• <pattern>
• <symbol>
• <svg>
• <text>