[fix] only use optimized 'src' handling for 'html' namespace (#6580)

src/compiler/compile/render_dom/wrappers/Element/Attribute.ts

@@ -86,8 +86,9 @@ export default class AttributeWrapper extends BaseAttributeWrapper {
 			this.is_select_value_attribute = this.name === 'value' && this.parent.node.name === 'select';
 			this.is_input_value = this.name === 'value' && this.parent.node.name === 'input';
 		}
-		
+
-		this.is_src = this.name === 'src'; // TODO retire this exception in favour of https://github.com/sveltejs/svelte/issues/3750
+		// TODO retire this exception in favour of https://github.com/sveltejs/svelte/issues/3750
+		this.is_src = this.name === 'src' && (!this.parent.node.namespace || this.parent.node.namespace === namespaces.html);
 		this.should_cache = should_cache(this);
 	}
 

src/runtime/internal/dom.ts

@@ -148,7 +148,7 @@ export function get_root_for_style(node: Node): ShadowRoot | Document {
 	if (!node) return document;
 
 	const root = node.getRootNode ? node.getRootNode() : node.ownerDocument;
-	if ((root as ShadowRoot).host) {
+	if (root && (root as ShadowRoot).host) {
 		return root as ShadowRoot;
 	}
 	return node.ownerDocument;

test/js/samples/src-attribute-check-in-foreign/_config.js

@@ -0,0 +1,5 @@
+export default {
+	options: {
+		hydratable: true
+	}
+};

test/js/samples/src-attribute-check-in-foreign/expected.js

@@ -0,0 +1,70 @@
+/* generated by Svelte vX.Y.Z */
+import {
+	SvelteComponent,
+	append_hydration,
+	attr,
+	children,
+	claim_element,
+	detach,
+	init,
+	insert_hydration,
+	noop,
+	safe_not_equal
+} from "svelte/internal";
+
+function create_fragment(ctx) {
+	let svg;
+	let img;
+
+	return {
+		c() {
+			svg = document.createElementNS("https://svelte.dev/docs#svelte_options", "svg");
+			img = document.createElementNS("https://svelte.dev/docs#svelte_options", "img");
+			this.h();
+		},
+		l(nodes) {
+			svg = claim_element(nodes, "svg", {});
+			var svg_nodes = children(svg);
+			img = claim_element(svg_nodes, "img", { alt: true, src: true });
+			svg_nodes.forEach(detach);
+			this.h();
+		},
+		h() {
+			attr(img, "alt", "potato");
+			attr(img, "src", /*url*/ ctx[0]);
+		},
+		m(target, anchor) {
+			insert_hydration(target, svg, anchor);
+			append_hydration(svg, img);
+		},
+		p(ctx, [dirty]) {
+			if (dirty & /*url*/ 1) {
+				attr(img, "src", /*url*/ ctx[0]);
+			}
+		},
+		i: noop,
+		o: noop,
+		d(detaching) {
+			if (detaching) detach(svg);
+		}
+	};
+}
+
+function instance($$self, $$props, $$invalidate) {
+	let { url } = $$props;
+
+	$$self.$$set = $$props => {
+		if ('url' in $$props) $$invalidate(0, url = $$props.url);
+	};
+
+	return [url];
+}
+
+class Component extends SvelteComponent {
+	constructor(options) {
+		super();
+		init(this, options, instance, create_fragment, safe_not_equal, { url: 0 });
+	}
+}
+
+export default Component;

test/js/samples/src-attribute-check-in-foreign/input.svelte

@@ -0,0 +1,9 @@
+<svelte:options namespace="foreign" />
+
+<script>
+	export let url;
+</script>
+
+<svg>
+	<img alt="potato" src={url}>
+</svg>

test/js/samples/src-attribute-check-in-svg/_config.js

@@ -0,0 +1,5 @@
+export default {
+	options: {
+		hydratable: true
+	}
+};

test/js/samples/src-attribute-check-in-svg/expected.js

@@ -0,0 +1,71 @@
+/* generated by Svelte vX.Y.Z */
+import {
+	SvelteComponent,
+	append_hydration,
+	attr,
+	children,
+	claim_element,
+	detach,
+	init,
+	insert_hydration,
+	noop,
+	safe_not_equal,
+	svg_element
+} from "svelte/internal";
+
+function create_fragment(ctx) {
+	let svg;
+	let img;
+
+	return {
+		c() {
+			svg = svg_element("svg");
+			img = svg_element("img");
+			this.h();
+		},
+		l(nodes) {
+			svg = claim_element(nodes, "svg", {}, 1);
+			var svg_nodes = children(svg);
+			img = claim_element(svg_nodes, "img", { alt: true, src: true }, 1);
+			svg_nodes.forEach(detach);
+			this.h();
+		},
+		h() {
+			attr(img, "alt", "potato");
+			attr(img, "src", /*url*/ ctx[0]);
+		},
+		m(target, anchor) {
+			insert_hydration(target, svg, anchor);
+			append_hydration(svg, img);
+		},
+		p(ctx, [dirty]) {
+			if (dirty & /*url*/ 1) {
+				attr(img, "src", /*url*/ ctx[0]);
+			}
+		},
+		i: noop,
+		o: noop,
+		d(detaching) {
+			if (detaching) detach(svg);
+		}
+	};
+}
+
+function instance($$self, $$props, $$invalidate) {
+	let { url } = $$props;
+
+	$$self.$$set = $$props => {
+		if ('url' in $$props) $$invalidate(0, url = $$props.url);
+	};
+
+	return [url];
+}
+
+class Component extends SvelteComponent {
+	constructor(options) {
+		super();
+		init(this, options, instance, create_fragment, safe_not_equal, { url: 0 });
+	}
+}
+
+export default Component;

test/js/samples/src-attribute-check-in-svg/input.svelte

@@ -0,0 +1,7 @@
+<script>
+	export let url;
+</script>
+
+<svg>
+	<img alt="potato" src={url}>
+</svg>