title = Global attribute
Text to be displayed in a tooltip when hovering over the element.
Each container element or graphics element in an SVG drawing can supply a
<title>element containing a description string where the description is text-only. When the current SVG document fragment is rendered as SVG on visual media,<title>element is not rendered as part of the graphics. However, some user agents may, for example, display the<title>element as a tooltip. Alternate presentations are possible, both visual and aural, which display the<title>element but do not display path elements or other graphics elements. The<title>element generally improves accessibility of SVG documents.
Generally
<title>element should be the first child element of its parent. Note that those implementations that do use<title>to display a tooltip often will only do so if the<title>is indeed the first child element of its parent.