[filter-effects-1] Elements with invalid filters

In https://drafts.fxtf.org/filter-effects/#FilterProperty, it is not clear what should happen if an invalid filter is applied to an element.

Should the element be rendered without any filter?
Should the rendering of the element be omitted entirely?
Should the invalid filter be corrected so the element with a valid filter be displayed?

The browsers disagree in displaying this test case:

<style>
    svg {
        border: 1px red solid;
        width: 400px;
        height: 300px;
    }
    .box {
        width: 200px;
        height: 200px;
        background-color: green;
        margin: 20px;
    }
    .filtered-1 {
        filter: drop-shadow(10px 10px -4px #4444dd);
    }
    .filtered-2 {
        filter: url(#shadow);
    }
</style>
<body>
    <p>A div element with invalid CSS filter:</p>
    <div class="box filtered-1"></div>
    <p>A div element with invalid referenced SVG filter:</p>
    <div class="box filtered-2"></div>
    <p>A rect element with invalid SVG filter:</p>
    <svg>
        <filter id="shadow">
            <feDropShadow dx="10" dy="10" stdDeviation="-4" flood-color="#4444dd" />
        </filter>
        <rect width="200" height="200" style="fill:green; filter:url(#shadow);" />
    </svg>
</body>

Safari does not display any SVG element with invalid SVG filter
Chrome seems to correct the SVG filter and is able to display any element that references this SVG filter
FireFox does no display any element with invalid SVG filters

w3c / fxtf-drafts

[filter-effects-1] Elements with invalid filters #564