diff --git a/src/dom/document.zig b/src/dom/document.zig
index 7e2ac989..23609600 100644
--- a/src/dom/document.zig
+++ b/src/dom/document.zig
@@ -7,6 +7,7 @@ const Case = jsruntime.test_utils.Case;
 const checkCases = jsruntime.test_utils.checkCases;
 
 const Node = @import("node.zig").Node;
+const HTMLCollection = @import("html_collection.zig").HTMLCollection;
 
 const Element = @import("element.zig").Element;
 const ElementUnion = @import("element.zig").Union;
@@ -34,6 +35,22 @@ pub const Document = struct {
         const e = parser.documentCreateElement(self, tag_name);
         return Element.toInterface(e);
     }
+
+    // We can't simply use libdom dom_document_get_elements_by_tag_name here.
+    // Indeed, netsurf implemented a previous dom spec when
+    // getElementsByTagName returned a NodeList.
+    // But since
+    // https://github.com/whatwg/dom/commit/190700b7c12ecfd3b5ebdb359ab1d6ea9cbf7749
+    // the spec changed to return an HTMLCollection instead.
+    // That's why we reimplemented getElementsByTagName by using an
+    // HTMLCollection in zig here.
+    pub fn _getElementsByTagName(self: *parser.Document, tag_name: []const u8) HTMLCollection {
+        const root = parser.documentGetDocumentElement(self);
+        return HTMLCollection{
+            .root = parser.elementToNode(root),
+            .match = tag_name,
+        };
+    }
 };
 
 // Tests
@@ -58,6 +75,19 @@ pub fn testExecFn(
     };
     try checkCases(js_env, &getElementById);
 
+    var getElementsByTagName = [_]Case{
+        .{ .src = "let getElementsByTagName = document.getElementsByTagName('p')", .ex = "undefined" },
+        .{ .src = "getElementsByTagName.length", .ex = "2" },
+        .{ .src = "getElementsByTagName.item(0).localName", .ex = "p" },
+        .{ .src = "getElementsByTagName.item(1).localName", .ex = "p" },
+        .{ .src = "let getElementsByTagNameAll = document.getElementsByTagName('*')", .ex = "undefined" },
+        .{ .src = "getElementsByTagNameAll.length", .ex = "8" },
+        .{ .src = "getElementsByTagNameAll.item(0).localName", .ex = "html" },
+        .{ .src = "getElementsByTagNameAll.item(7).localName", .ex = "p" },
+        .{ .src = "getElementsByTagNameAll.namedItem('para-empty-child').localName", .ex = "span" },
+    };
+    try checkCases(js_env, &getElementsByTagName);
+
     const tags = comptime parser.Tag.all();
     comptime var createElements: [(tags.len) * 2]Case = undefined;
     inline for (tags, 0..) |tag, i| {
diff --git a/src/dom/html_collection.zig b/src/dom/html_collection.zig
new file mode 100644
index 00000000..10cfb78f
--- /dev/null
+++ b/src/dom/html_collection.zig
@@ -0,0 +1,210 @@
+const std = @import("std");
+
+const parser = @import("../netsurf.zig");
+
+const jsruntime = @import("jsruntime");
+const Case = jsruntime.test_utils.Case;
+const checkCases = jsruntime.test_utils.checkCases;
+
+const utils = @import("utils.z");
+const Element = @import("element.zig").Element;
+const Union = @import("element.zig").Union;
+
+// WEB IDL https://dom.spec.whatwg.org/#htmlcollection
+// HTMLCollection is re implemented in zig here because libdom
+// dom_html_collection expects a comparison function callback as arguement.
+// But we wanted a dynamically comparison here, according to the match tagname.
+pub const HTMLCollection = struct {
+    pub const mem_guarantied = true;
+
+    root: *parser.Node,
+    // match is used to select node against their name.
+    // match comparison is case insensitive.
+    match: []const u8,
+
+    // save a state for the collection to improve the _item speed.
+    cur_idx: ?u32 = undefined,
+    cur_node: ?*parser.Node = undefined,
+
+    // get_next iterates over the DOM tree to return the next following node or
+    // null at the end.
+    //
+    // This implementation is a zig version of Netsurf code.
+    // http://source.netsurf-browser.org/libdom.git/tree/src/html/html_collection.c#n177
+    //
+    // The iteration is a depth first as required by the specification.
+    // https://dom.spec.whatwg.org/#htmlcollection
+    // https://dom.spec.whatwg.org/#concept-tree-order
+    fn get_next(root: *parser.Node, cur: *parser.Node) ?*parser.Node {
+        // TODO deinit next
+        if (parser.nodeFirstChild(cur)) |next| {
+            return next;
+        }
+
+        // TODO deinit next
+        if (parser.nodeNextSibling(cur)) |next| {
+            return next;
+        }
+
+        // TODO deinit parent
+        // Back to the parent of cur.
+        // If cur has no parent, then the iteration is over.
+        var parent = parser.nodeParentNode(cur) orelse return null;
+
+        // TODO deinit lastchild
+        var lastchild = parser.nodeLastChild(parent);
+        var prev = cur;
+        while (prev != root and prev == lastchild) {
+            prev = parent;
+
+            // TODO deinit parent
+            // Back to the prev's parent.
+            // If prev has no parent, then the loop must stop.
+            parent = parser.nodeParentNode(prev) orelse break;
+
+            // TODO deinit lastchild
+            lastchild = parser.nodeLastChild(parent);
+        }
+
+        if (prev == root) {
+            return null;
+        }
+
+        return parser.nodeNextSibling(prev);
+    }
+
+    /// get_length computes the collection's length dynamically according to
+    /// the current root structure.
+    // TODO: nodes retrieved must be de-referenced.
+    pub fn get_length(self: *HTMLCollection, allocator: std.mem.Allocator) !u32 {
+        var len: u32 = 0;
+        var node: *parser.Node = self.root;
+        var ntype: parser.NodeType = undefined;
+
+        const imatch = try std.ascii.allocUpperString(allocator, self.match);
+        defer allocator.free(imatch);
+
+        const is_wildcard = std.mem.eql(u8, self.match, "*");
+
+        while (true) {
+            ntype = parser.nodeType(node);
+            if (ntype == .element) {
+                if (is_wildcard or std.mem.eql(u8, imatch, parser.nodeName(node))) {
+                    len += 1;
+                }
+            }
+
+            node = get_next(self.root, node) orelse break;
+        }
+
+        return len;
+    }
+
+    pub fn _item(self: *HTMLCollection, allocator: std.mem.Allocator, index: u32) !?Union {
+        var i: u32 = 0;
+        var node: *parser.Node = self.root;
+        var ntype: parser.NodeType = undefined;
+
+        const is_wildcard = std.mem.eql(u8, self.match, "*");
+
+        // Use the current state to improve speed if possible.
+        if (self.cur_idx != null and index >= self.cur_idx.?) {
+            i = self.cur_idx.?;
+            node = self.cur_node.?;
+        }
+
+        const imatch = try std.ascii.allocUpperString(allocator, self.match);
+        defer allocator.free(imatch);
+
+        while (true) {
+            ntype = parser.nodeType(node);
+            if (ntype == .element) {
+                if (is_wildcard or std.mem.eql(u8, imatch, parser.nodeName(node))) {
+                    // check if we found the searched element.
+                    if (i == index) {
+                        // save the current state
+                        self.cur_node = node;
+                        self.cur_idx = i;
+
+                        const e = @as(*parser.Element, @ptrCast(node));
+                        return Element.toInterface(e);
+                    }
+
+                    i += 1;
+                }
+            }
+
+            node = get_next(self.root, node) orelse break;
+        }
+
+        return null;
+    }
+
+    pub fn _namedItem(self: *HTMLCollection, allocator: std.mem.Allocator, name: []const u8) !?Union {
+        if (name.len == 0) {
+            return null;
+        }
+
+        var node: *parser.Node = self.root;
+        var ntype: parser.NodeType = undefined;
+
+        const is_wildcard = std.mem.eql(u8, self.match, "*");
+
+        const imatch = try std.ascii.allocUpperString(allocator, self.match);
+        defer allocator.free(imatch);
+
+        while (true) {
+            ntype = parser.nodeType(node);
+            if (ntype == .element) {
+                if (is_wildcard or std.mem.eql(u8, imatch, parser.nodeName(node))) {
+                    const elem = @as(*parser.Element, @ptrCast(node));
+
+                    var attr = parser.elementGetAttribute(elem, "id");
+                    // check if the node id corresponds to the name argument.
+                    if (attr != null and std.mem.eql(u8, name, attr.?)) {
+                        return Element.toInterface(elem);
+                    }
+
+                    attr = parser.elementGetAttribute(elem, "name");
+                    // check if the node id corresponds to the name argument.
+                    if (attr != null and std.mem.eql(u8, name, attr.?)) {
+                        return Element.toInterface(elem);
+                    }
+                }
+            }
+
+            node = get_next(self.root, node) orelse break;
+        }
+
+        return null;
+    }
+};
+
+// Tests
+// -----
+
+pub fn testExecFn(
+    _: std.mem.Allocator,
+    js_env: *jsruntime.Env,
+    comptime _: []jsruntime.API,
+) !void {
+    var getElementsByTagName = [_]Case{
+        .{ .src = "let getElementsByTagName = document.getElementsByTagName('p')", .ex = "undefined" },
+        .{ .src = "getElementsByTagName.length", .ex = "2" },
+        .{ .src = "let getElementsByTagNameCI = document.getElementsByTagName('P')", .ex = "undefined" },
+        .{ .src = "getElementsByTagNameCI.length", .ex = "2" },
+        .{ .src = "getElementsByTagName.item(0).localName", .ex = "p" },
+        .{ .src = "getElementsByTagName.item(1).localName", .ex = "p" },
+        .{ .src = "let getElementsByTagNameAll = document.getElementsByTagName('*')", .ex = "undefined" },
+        .{ .src = "getElementsByTagNameAll.length", .ex = "8" },
+        .{ .src = "getElementsByTagNameAll.item(0).localName", .ex = "html" },
+        .{ .src = "getElementsByTagNameAll.item(0).localName", .ex = "html" },
+        .{ .src = "getElementsByTagNameAll.item(1).localName", .ex = "head" },
+        .{ .src = "getElementsByTagNameAll.item(0).localName", .ex = "html" },
+        .{ .src = "getElementsByTagNameAll.item(2).localName", .ex = "body" },
+        .{ .src = "getElementsByTagNameAll.item(3).localName", .ex = "div" },
+        .{ .src = "getElementsByTagNameAll.item(7).localName", .ex = "p" },
+        .{ .src = "getElementsByTagNameAll.namedItem('para-empty-child').localName", .ex = "span" },
+    };
+    try checkCases(js_env, &getElementsByTagName);
+}
diff --git a/src/dom/node.zig b/src/dom/node.zig
index 3b9005b3..a57a94a9 100644
--- a/src/dom/node.zig
+++ b/src/dom/node.zig
@@ -14,6 +14,7 @@ const EventTarget = @import("event_target.zig").EventTarget;
 const CData = @import("character_data.zig");
 const Element = @import("element.zig").Element;
 const Document = @import("document.zig").Document;
+const HTMLCollection = @import("html_collection.zig").HTMLCollection;
 
 // HTML
 const HTML = @import("../html/html.zig");
@@ -25,6 +26,7 @@ pub const Interfaces = generate.Tuple(.{
     CData.Interfaces,
     Element,
     Document,
+    HTMLCollection,
 
     HTML.Interfaces,
 });
diff --git a/src/main_wpt.zig b/src/main_wpt.zig
index 7f567ea2..96c8ad42 100644
--- a/src/main_wpt.zig
+++ b/src/main_wpt.zig
@@ -205,6 +205,11 @@ fn runWPT(arena: *std.heap.ArenaAllocator, comptime apis: []jsruntime.API, f: []
         \\  return true;
         \\};
         \\window.removeEventListener = function () {};
+        \\
+        \\console = [];
+        \\console.log = function () {
+        \\  console.push(...arguments);
+        \\};
     ;
     res = try evalJS(js_env, alloc, init, "init");
     if (!res.success) {
@@ -247,6 +252,12 @@ fn runWPT(arena: *std.heap.ArenaAllocator, comptime apis: []jsruntime.API, f: []
         return res;
     }
 
+    // display console logs
+    res = try evalJS(js_env, alloc, "console.join(', ');", "console");
+    if (res.result.len > 0) {
+        std.debug.print("-- CONSOLE LOG\n{s}\n--\n", .{res.result});
+    }
+
     // Check the final test status.
     res = try evalJS(js_env, alloc, "report.status;", "teststatus");
     if (!res.success) {
diff --git a/src/netsurf.zig b/src/netsurf.zig
index 5f246d98..24bb1771 100644
--- a/src/netsurf.zig
+++ b/src/netsurf.zig
@@ -597,6 +597,9 @@ pub fn textSplitText(text: *Text, offset: u32) *Text {
 // Comment
 pub const Comment = c.dom_comment;
 
+// Attribute
+pub const Attribute = c.dom_attr;
+
 // Element
 pub const Element = c.dom_element;
 
@@ -618,6 +621,11 @@ pub fn elementGetAttribute(elem: *Element, name: []const u8) ?[]const u8 {
     return stringToData(s.?);
 }
 
+// elementToNode is an helper to convert an element to a node.
+pub inline fn elementToNode(e: *Element) *Node {
+    return @as(*Node, @ptrCast(e));
+}
+
 // ElementHTML
 pub const ElementHTML = c.dom_html_element;
 
@@ -731,6 +739,13 @@ pub inline fn documentGetElementsByTagName(doc: *Document, tagname: []const u8)
     return nlist.?;
 }
 
+// documentGetDocumentElement returns the root document element.
+pub inline fn documentGetDocumentElement(doc: *Document) *Element {
+    var elem: ?*Element = undefined;
+    _ = documentVtable(doc).dom_document_get_document_element.?(doc, &elem);
+    return elem.?;
+}
+
 pub inline fn documentCreateElement(doc: *Document, tag_name: []const u8) *Element {
     var elem: ?*Element = undefined;
     _ = documentVtable(doc).dom_document_create_element.?(doc, stringFromData(tag_name), &elem);
diff --git a/src/run_tests.zig b/src/run_tests.zig
index 8860bc67..b5ad7159 100644
--- a/src/run_tests.zig
+++ b/src/run_tests.zig
@@ -11,6 +11,7 @@ const HTMLDocumentTestExecFn = @import("html/document.zig").testExecFn;
 const nodeTestExecFn = @import("dom/node.zig").testExecFn;
 const characterDataTestExecFn = @import("dom/character_data.zig").testExecFn;
 const textTestExecFn = @import("dom/text.zig").testExecFn;
+const HTMLCollectionTestExecFn = @import("dom/html_collection.zig").testExecFn;
 
 var doc: *parser.DocumentHTML = undefined;
 
@@ -51,6 +52,7 @@ fn testsAllExecFn(
         nodeTestExecFn,
         characterDataTestExecFn,
         textTestExecFn,
+        HTMLCollectionTestExecFn,
     };
 
     inline for (testFns) |testFn| {
diff --git a/tests/wpt/dom/nodes/Document-Element-getElementsByTagName.js b/tests/wpt/dom/nodes/Document-Element-getElementsByTagName.js
new file mode 100644
index 00000000..dbbe667f
--- /dev/null
+++ b/tests/wpt/dom/nodes/Document-Element-getElementsByTagName.js
@@ -0,0 +1,208 @@
+function test_getElementsByTagName(context, element) {
+  // TODO: getElementsByTagName("*")
+  test(function() {
+    assert_false(context.getElementsByTagName("html") instanceof NodeList,
+                 "Should not return a NodeList")
+    assert_true(context.getElementsByTagName("html") instanceof HTMLCollection,
+                "Should return an HTMLCollection")
+  }, "Interfaces")
+
+  test(function() {
+    var firstCollection = context.getElementsByTagName("html"),
+        secondCollection = context.getElementsByTagName("html")
+    assert_true(firstCollection !== secondCollection ||
+                firstCollection === secondCollection)
+  }, "Caching is allowed")
+
+  test(function() {
+    var l = context.getElementsByTagName("nosuchtag")
+    l[5] = "foopy"
+    assert_equals(l[5], undefined)
+    assert_equals(l.item(5), null)
+  }, "Shouldn't be able to set unsigned properties on a HTMLCollection (non-strict mode)")
+
+  test(function() {
+    var l = context.getElementsByTagName("nosuchtag")
+    assert_throws_js(TypeError, function() {
+      "use strict";
+      l[5] = "foopy"
+    })
+    assert_equals(l[5], undefined)
+    assert_equals(l.item(5), null)
+  }, "Shouldn't be able to set unsigned properties on a HTMLCollection (strict mode)")
+
+  test(function() {
+    var l = context.getElementsByTagName("nosuchtag")
+    var fn = l.item;
+    assert_equals(fn, HTMLCollection.prototype.item);
+    l.item = "pass"
+    assert_equals(l.item, "pass")
+    assert_equals(HTMLCollection.prototype.item, fn);
+  }, "Should be able to set expando shadowing a proto prop (item)")
+
+  test(function() {
+    var l = context.getElementsByTagName("nosuchtag")
+    var fn = l.namedItem;
+    assert_equals(fn, HTMLCollection.prototype.namedItem);
+    l.namedItem = "pass"
+    assert_equals(l.namedItem, "pass")
+    assert_equals(HTMLCollection.prototype.namedItem, fn);
+  }, "Should be able to set expando shadowing a proto prop (namedItem)")
+
+  test(function() {
+    var t1 = element.appendChild(document.createElement("pre"));
+    t1.id = "x";
+    var t2 = element.appendChild(document.createElement("pre"));
+    t2.setAttribute("name", "y");
+    var t3 = element.appendChild(document.createElementNS("", "pre"));
+    t3.setAttribute("id", "z");
+    var t4 = element.appendChild(document.createElementNS("", "pre"));
+    t4.setAttribute("name", "w");
+    this.add_cleanup(function() {
+      element.removeChild(t1)
+      element.removeChild(t2)
+      element.removeChild(t3)
+      element.removeChild(t4)
+    });
+
+    var list = context.getElementsByTagName('pre');
+    var pre = list[0];
+    assert_equals(pre.id, "x");
+
+    var exposedNames = { 'x': 0, 'y': 1, 'z': 2 };
+    for (var exposedName in exposedNames) {
+      assert_equals(list[exposedName], list[exposedNames[exposedName]]);
+      assert_equals(list[exposedName], list.namedItem(exposedName));
+      assert_true(exposedName in list, "'" + exposedName + "' in list");
+      assert_true(list.hasOwnProperty(exposedName),
+                  "list.hasOwnProperty('" + exposedName + "')");
+    }
+
+    var unexposedNames = ["w"];
+    for (var unexposedName of unexposedNames) {
+      assert_false(unexposedName in list);
+      assert_false(list.hasOwnProperty(unexposedName));
+      assert_equals(list[unexposedName], undefined);
+      assert_equals(list.namedItem(unexposedName), null);
+    }
+
+    assert_array_equals(Object.getOwnPropertyNames(list).sort(),
+                        ["0", "1", "2", "3", "x", "y", "z"]);
+
+    var desc = Object.getOwnPropertyDescriptor(list, '0');
+    assert_equals(typeof desc, "object", "descriptor should be an object");
+    assert_true(desc.enumerable, "desc.enumerable");
+    assert_true(desc.configurable, "desc.configurable");
+
+    desc = Object.getOwnPropertyDescriptor(list, 'x');
+    assert_equals(typeof desc, "object", "descriptor should be an object");
+    assert_false(desc.enumerable, "desc.enumerable");
+    assert_true(desc.configurable, "desc.configurable");
+  }, "hasOwnProperty, getOwnPropertyDescriptor, getOwnPropertyNames")
+
+  test(function() {
+    assert_equals(document.createElementNS("http://www.w3.org/1999/xhtml", "i").localName, "i") // Sanity
+    var t = element.appendChild(document.createElementNS("http://www.w3.org/1999/xhtml", "I"))
+    this.add_cleanup(function() {element.removeChild(t)})
+    assert_equals(t.localName, "I")
+    assert_equals(t.tagName, "I")
+    assert_equals(context.getElementsByTagName("I").length, 0)
+    assert_equals(context.getElementsByTagName("i").length, 0)
+  }, "HTML element with uppercase tagName never matches in HTML Documents")
+
+  test(function() {
+    var t = element.appendChild(document.createElementNS("test", "st"))
+    this.add_cleanup(function() {element.removeChild(t)})
+    assert_array_equals(context.getElementsByTagName("st"), [t])
+    assert_array_equals(context.getElementsByTagName("ST"), [])
+  }, "Element in non-HTML namespace, no prefix, lowercase name")
+
+  test(function() {
+    var t = element.appendChild(document.createElementNS("test", "ST"))
+    this.add_cleanup(function() {element.removeChild(t)})
+    assert_array_equals(context.getElementsByTagName("ST"), [t])
+    assert_array_equals(context.getElementsByTagName("st"), [])
+  }, "Element in non-HTML namespace, no prefix, uppercase name")
+
+  test(function() {
+    var t = element.appendChild(document.createElementNS("test", "te:st"))
+    this.add_cleanup(function() {element.removeChild(t)})
+    assert_array_equals(context.getElementsByTagName("st"), [])
+    assert_array_equals(context.getElementsByTagName("ST"), [])
+    assert_array_equals(context.getElementsByTagName("te:st"), [t])
+    assert_array_equals(context.getElementsByTagName("te:ST"), [])
+  }, "Element in non-HTML namespace, prefix, lowercase name")
+
+  test(function() {
+    var t = element.appendChild(document.createElementNS("test", "te:ST"))
+    this.add_cleanup(function() {element.removeChild(t)})
+    assert_array_equals(context.getElementsByTagName("st"), [])
+    assert_array_equals(context.getElementsByTagName("ST"), [])
+    assert_array_equals(context.getElementsByTagName("te:st"), [])
+    assert_array_equals(context.getElementsByTagName("te:ST"), [t])
+  }, "Element in non-HTML namespace, prefix, uppercase name")
+
+  test(function() {
+    var t = element.appendChild(document.createElement("aÇ"))
+    this.add_cleanup(function() {element.removeChild(t)})
+    assert_equals(t.localName, "aÇ")
+    assert_array_equals(context.getElementsByTagName("AÇ"), [t], "All uppercase input")
+    assert_array_equals(context.getElementsByTagName("aÇ"), [t], "Ascii lowercase input")
+    assert_array_equals(context.getElementsByTagName("aç"), [], "All lowercase input")
+  }, "Element in HTML namespace, no prefix, non-ascii characters in name")
+
+  test(function() {
+    var t = element.appendChild(document.createElementNS("test", "AÇ"))
+    this.add_cleanup(function() {element.removeChild(t)})
+    assert_array_equals(context.getElementsByTagName("AÇ"), [t])
+    assert_array_equals(context.getElementsByTagName("aÇ"), [])
+    assert_array_equals(context.getElementsByTagName("aç"), [])
+  }, "Element in non-HTML namespace, non-ascii characters in name")
+
+  test(function() {
+    var t = element.appendChild(document.createElementNS("http://www.w3.org/1999/xhtml", "test:aÇ"))
+    this.add_cleanup(function() {element.removeChild(t)})
+    assert_array_equals(context.getElementsByTagName("TEST:AÇ"), [t], "All uppercase input")
+    assert_array_equals(context.getElementsByTagName("test:aÇ"), [t], "Ascii lowercase input")
+    assert_array_equals(context.getElementsByTagName("test:aç"), [], "All lowercase input")
+  }, "Element in HTML namespace, prefix, non-ascii characters in name")
+
+  test(function() {
+    var t = element.appendChild(document.createElementNS("test", "TEST:AÇ"))
+    this.add_cleanup(function() {element.removeChild(t)})
+    assert_array_equals(context.getElementsByTagName("TEST:AÇ"), [t], "All uppercase input")
+    assert_array_equals(context.getElementsByTagName("test:aÇ"), [], "Ascii lowercase input")
+    assert_array_equals(context.getElementsByTagName("test:aç"), [], "All lowercase input")
+  }, "Element in non-HTML namespace, prefix, non-ascii characters in name")
+
+  test(function() {
+    var actual = context.getElementsByTagName("*");
+    var expected = [];
+    var get_elements = function(node) {
+      for (var i = 0; i < node.childNodes.length; i++) {
+        var child = node.childNodes[i];
+        if (child.nodeType === child.ELEMENT_NODE) {
+          expected.push(child);
+          get_elements(child);
+        }
+      }
+    }
+    get_elements(context);
+    assert_array_equals(actual, expected);
+  }, "getElementsByTagName('*')")
+
+  test(function() {
+    var t1 = element.appendChild(document.createElement("abc"));
+    this.add_cleanup(function() {element.removeChild(t1)});
+
+    var l = context.getElementsByTagName("abc");
+    assert_true(l instanceof HTMLCollection);
+    assert_equals(l.length, 1);
+
+    var t2 = element.appendChild(document.createElement("abc"));
+    assert_equals(l.length, 2);
+
+    element.removeChild(t2);
+    assert_equals(l.length, 1);
+  }, "getElementsByTagName() should be a live collection");
+}
diff --git a/tests/wpt/dom/nodes/Document-getElementsByTagName.html b/tests/wpt/dom/nodes/Document-getElementsByTagName.html
new file mode 100644
index 00000000..00e3435c
--- /dev/null
+++ b/tests/wpt/dom/nodes/Document-getElementsByTagName.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Document.getElementsByTagName</title>
+<link rel=help href="https://dom.spec.whatwg.org/#dom-document-getelementsbytagname">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="Document-Element-getElementsByTagName.js"></script>
+<div id="log"></div>
+<script>
+test_getElementsByTagName(document, document.body);
+</script>