diff --git a/cjs/svg/element.js b/cjs/svg/element.js
index f68bff70..15220650 100644
--- a/cjs/svg/element.js
+++ b/cjs/svg/element.js
@@ -41,6 +41,11 @@ class SVGElement extends Element {
     return 'http://www.w3.org/2000/svg';
   }
 
+  // https://dom.spec.whatwg.org/#element-html-uppercased-qualified-name
+  // only elements in the HTML namespace are upper-cased in an HTML document
+  get nodeName() { return this.localName; }
+  get tagName() { return this.localName; }
+
   getAttribute(name) {
     return name === 'class' ?
       [...this.classList].join(' ') :
diff --git a/esm/svg/element.js b/esm/svg/element.js
index 84d54a6d..8c93fb1f 100644
--- a/esm/svg/element.js
+++ b/esm/svg/element.js
@@ -40,6 +40,11 @@ export class SVGElement extends Element {
     return 'http://www.w3.org/2000/svg';
   }
 
+  // https://dom.spec.whatwg.org/#element-html-uppercased-qualified-name
+  // only elements in the HTML namespace are upper-cased in an HTML document
+  get nodeName() { return this.localName; }
+  get tagName() { return this.localName; }
+
   getAttribute(name) {
     return name === 'class' ?
       [...this.classList].join(' ') :
diff --git a/test/svg/element.js b/test/svg/element.js
index 4f5259ca..e7350386 100644
--- a/test/svg/element.js
+++ b/test/svg/element.js
@@ -32,6 +32,14 @@ document = (new DOMParser).parseFromString(`<!doctype html><html><svg><rect /></
 
 assert('ownerSVGElement' in document.querySelector('svg rect'), true, 'svg restored');
 
+// https://github.com/WebReflection/linkedom/issues/344
+assert(document.querySelector('svg').tagName, 'svg', '<svg> tagName keeps its case in an HTML document');
+assert(document.querySelector('svg rect').tagName, 'rect', '<rect> tagName keeps its case in an HTML document');
+assert(document.querySelector('svg rect').nodeName, 'rect', '<rect> nodeName keeps its case in an HTML document');
+assert(document.createElementNS('http://www.w3.org/2000/svg', 'path').tagName, 'path', 'createElementNS tagName keeps its case');
+assert(document.createElementNS('http://www.w3.org/2000/svg', 'path').nodeName, 'path', 'createElementNS nodeName keeps its case');
+assert(document.documentElement.tagName, 'HTML', 'HTML elements are still upper-cased');
+
 svg.className.what = 'ever';
 
 assert(svg.className.what, 'ever', '<svg>.className');