# EPUBCheck HTM_063: SVG xlink:href attribute value (…)…

Source: https://epublab.com/epubcheck/htm_063/ (updated 2026-11-03)

EPUBCheck HTM_063 is a usage message: “SVG "xlink:href" attribute value ("…") should be equal to the "href" attribute value ("…").” An SVG element has both xlink:href and href, with different values.

- Official message (EPUBCheck 5.4.0): SVG "xlink:href" attribute value ("%1$s") should be equal to the "href" attribute value ("%2$s").
- Default severity: Usage

## Typical causes

- One of the two attributes updated and the other forgotten.

## How to fix it

- Make both values the same, or keep only href.

Message text and severity: EPUBCheck (W3C, BSD-3-Clause). Explanation: EPUBLab.