Re: [fxtf-drafts] [geometry] DOMMatrixReadOnly string init depends on backwards compatibility syntax

@zcorpan Does it use the strict mode for parsing? I could see users doing something like

```js
new DOMMatrix(svgElement.getAttribute('transform'));
```

`transform` is a presentation attribute in SVG. So it can be set using an element attribute. SVG transform attributes _must_ be compatible the SVG syntax.

In WebKit we implemented transform as a presentation attributes and it does get parsed by the CSS parser. The attribute value _does not_ get parsed in strict mode allowing unit-less values for instance.

I am fine with using the CSS parser but we should definitely not use the strict mode!

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