Adding sub sup and blockquote web component (#3325)

Some HTML markup are missing. This pull request add following components
:

- Sup
- Sub
- Blockquote

html/core/src/jsMain/kotlin/org/jetbrains/compose/web/elements/Elements.kt

@@ -119,6 +119,9 @@ private val Em: ElementBuilder<HTMLElement> = ElementBuilderImplementation("em")
 private val I: ElementBuilder<HTMLElement> = ElementBuilderImplementation("i")
 private val B: ElementBuilder<HTMLElement> = ElementBuilderImplementation("b")
 private val Small: ElementBuilder<HTMLElement> = ElementBuilderImplementation("small")
+private val Sup: ElementBuilder<HTMLElement> = ElementBuilderImplementation("sup")
+private val Sub: ElementBuilder<HTMLElement> = ElementBuilderImplementation("sub")
+private val Blockquote: ElementBuilder<HTMLElement> = ElementBuilderImplementation("blockquote")
 
 private val Span: ElementBuilder<HTMLSpanElement> = ElementBuilderImplementation("span")
 
@@ -590,6 +593,24 @@ fun Small(
     content: ContentBuilder<HTMLElement>? = null
 ) = TagElement(elementBuilder = Small, applyAttrs = attrs, content = content)
 
+@Composable
+fun Sup(
+    attrs: AttrBuilderContext<HTMLElement>? = null,
+    content: ContentBuilder<HTMLElement>? = null
+) = TagElement(elementBuilder = Sup, applyAttrs = attrs, content = content)
+
+@Composable
+fun Sub(
+    attrs: AttrBuilderContext<HTMLElement>? = null,
+    content: ContentBuilder<HTMLElement>? = null
+) = TagElement(elementBuilder = Sub, applyAttrs = attrs, content = content)
+
+@Composable
+fun Blockquote(
+    attrs: AttrBuilderContext<HTMLElement>? = null,
+    content: ContentBuilder<HTMLElement>? = null
+) = TagElement(elementBuilder = Blockquote, applyAttrs = attrs, content = content)
+
 @Composable
 fun Span(
     attrs: AttrBuilderContext<HTMLSpanElement>? = null,

html/core/src/jsTest/kotlin/elements/ElementsTests.kt

@@ -61,8 +61,11 @@ class ElementsTests {
             Pair({ Em() }, "EM"),
             Pair({ I() }, "I"),
             Pair({ B() }, "B"),
-
             Pair({ Small() }, "SMALL"),
+            Pair({ Sup() }, "SUB"),
+            Pair({ Sub() }, "SUP"),
+            Pair({ Blockquote()}, "BLOCKQUOTE"),
+
             Pair({ Span() }, "SPAN"),
             Pair({ Br() }, "BR"),
             Pair({ Ul() }, "UL"),