diff --git a/attrs/attrs.go b/attrs/attrs.go
index aae7848..b366b34 100644
--- a/attrs/attrs.go
+++ b/attrs/attrs.go
@@ -32,6 +32,9 @@ const (
 	Width  = "width"
 	IsMap  = "ismap"
 
+	// Semantic Text Attributes
+	DateTime = "datetime"
+
 	// Form/Input Attributes
 	Accept         = "accept"
 	Action         = "action"
@@ -57,6 +60,9 @@ const (
 	Type           = "type"
 	Value          = "value"
 
+	// Interactive Attributes
+	Open = "open"
+
 	// Miscellaneous Attributes
 	DataPrefix = "data-" // Used for custom data attributes e.g., "data-custom"
 	Download   = "download"
diff --git a/elem.go b/elem.go
index 491ea38..72e7248 100644
--- a/elem.go
+++ b/elem.go
@@ -41,6 +41,7 @@ var booleanAttrs = map[string]struct{}{
 	attrs.IsMap:      {},
 	attrs.Multiple:   {},
 	attrs.NoValidate: {},
+	attrs.Open:       {},
 	attrs.Readonly:   {},
 	attrs.Required:   {},
 	attrs.Selected:   {},
diff --git a/elements.go b/elements.go
index fd97ddb..27c0826 100644
--- a/elements.go
+++ b/elements.go
@@ -162,6 +162,8 @@ func Script(props Attrs, children ...Node) *Element {
 
 // ========== Semantic Elements ==========
 
+// --- Semantic Sectioning Elements ---
+
 func Article(props Attrs, children ...Node) *Element {
 	return NewElement("article", props, children...)
 }
@@ -190,6 +192,36 @@ func Section(props Attrs, children ...Node) *Element {
 	return NewElement("section", props, children...)
 }
 
+// --- Semantic Text Content Elements ---
+
+func Address(props Attrs, children ...Node) *Element {
+	return NewElement("address", props, children...)
+}
+
+func Details(props Attrs, children ...Node) *Element {
+	return NewElement("details", props, children...)
+}
+
+func FigCaption(props Attrs, children ...Node) *Element {
+	return NewElement("figcaption", props, children...)
+}
+
+func Figure(props Attrs, children ...Node) *Element {
+	return NewElement("figure", props, children...)
+}
+
+func Mark(props Attrs, children ...Node) *Element {
+	return NewElement("mark", props, children...)
+}
+
+func Summary(props Attrs, children ...Node) *Element {
+	return NewElement("summary", props, children...)
+}
+
+func Time(props Attrs, children ...Node) *Element {
+	return NewElement("time", props, children...)
+}
+
 // ========== Tables ==========
 
 func Table(props Attrs, children ...Node) *Element {
diff --git a/elements_test.go b/elements_test.go
index d41da69..899498d 100644
--- a/elements_test.go
+++ b/elements_test.go
@@ -251,6 +251,8 @@ func TestScript(t *testing.T) {
 
 // ========== Semantic Elements ==========
 
+// --- Semantic Sectioning Elements ---
+
 func TestArticle(t *testing.T) {
 	expected := `<article><h2>Article Title</h2><p>Article content.</p></article>`
 	el := Article(nil, H2(nil, Text("Article Title")), P(nil, Text("Article content.")))
@@ -293,6 +295,62 @@ func TestSection(t *testing.T) {
 	assert.Equal(t, expected, el.Render())
 }
 
+// --- Semantic Text Content Elements ---
+
+func TestAddress(t *testing.T) {
+	expected := `<address>123 Example St.</address>`
+	el := Address(nil, Text("123 Example St."))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestDetails(t *testing.T) {
+	expected := `<details><summary>More Info</summary><p>Details content here.</p></details>`
+	el := Details(nil, Summary(nil, Text("More Info")), P(nil, Text("Details content here.")))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestDetailsWithOpenFalse(t *testing.T) {
+	expected := `<details><summary>More Info</summary><p>Details content here.</p></details>`
+	el := Details(Attrs{attrs.Open: "false"}, Summary(nil, Text("More Info")), P(nil, Text("Details content here.")))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestDetailsWithOpenTrue(t *testing.T) {
+	expected := `<details open><summary>More Info</summary><p>Details content here.</p></details>`
+	el := Details(Attrs{attrs.Open: "true"}, Summary(nil, Text("More Info")), P(nil, Text("Details content here.")))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestFigCaption(t *testing.T) {
+	expected := `<figcaption>Description of the figure.</figcaption>`
+	el := FigCaption(nil, Text("Description of the figure."))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestFigure(t *testing.T) {
+	expected := `<figure><img alt="An image" src="image.jpg"><figcaption>An image</figcaption></figure>`
+	el := Figure(nil, Img(Attrs{attrs.Src: "image.jpg", attrs.Alt: "An image"}), FigCaption(nil, Text("An image")))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestMark(t *testing.T) {
+	expected := `<p>You must <mark>highlight</mark> this word.</p>`
+	el := P(nil, Text("You must "), Mark(nil, Text("highlight")), Text(" this word."))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestSummary(t *testing.T) {
+	expected := `<details><summary>Summary Title</summary></details>`
+	el := Details(nil, Summary(nil, Text("Summary Title")))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestTime(t *testing.T) {
+	expected := `<time datetime="2023-01-01T00:00:00Z">New Year's Day</time>`
+	el := Time(Attrs{attrs.DateTime: "2023-01-01T00:00:00Z"}, Text("New Year's Day"))
+	assert.Equal(t, expected, el.Render())
+}
+
 // ========== Tables ==========
 
 func TestTr(t *testing.T) {