Example

A complete example SVG file containing the unsupported tags is added as an attachment: test.svg.

The relevant lines are:

<text fill="#000000" x="140" y="270" font-size="12" text-anchor="middle" dy="12" font-family="Helvetica">40</text>

<text fill="#000000" x="186" y="270" font-size="12" text-anchor="middle" baseline-shift="-12" font-family="Helvetica">60</text>

The SVG file should be rendered as:

But it is wrongly rendered as, i.e. ignoring the dy and baseline-shift attributes:

It is clearly visible that the x axis tick labels are printed too high.