tested static and framed serving, it works

go.mod

@@ -17,6 +17,7 @@ require (
 	github.com/labstack/gommon v0.4.2
 	github.com/sirupsen/logrus v1.9.3
 	github.com/tkuchiki/go-timezone v0.2.3
+	golang.org/x/net v0.50.0
 	golang.org/x/text v0.34.0
 	gopkg.in/yaml.v3 v3.0.1
 )
@@ -31,7 +32,6 @@ require (
 	github.com/valyala/fasttemplate v1.2.2 // indirect
 	golang.org/x/crypto v0.48.0 // indirect
 	golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8 // indirect
-	golang.org/x/net v0.50.0 // indirect
 	golang.org/x/sys v0.41.0 // indirect
 	golang.org/x/time v0.11.0 // indirect
 )

ui/static.go

@@ -72,7 +72,7 @@ func breakUpHTML(r io.Reader) (string, string, error) {
 		if n.Type == html.ElementNode {
 			switch n.Data {
 			case "title":
-				body = extractPlainText(n)
+				title = extractPlainText(n)
 			case "body":
 				body = extractInnerHTML(n)
 			}
@@ -95,13 +95,20 @@ func breakUpHTML(r io.Reader) (string, string, error) {
  */
 func AmStaticFramePage(staticFS fs.FS, prefix string) AmPageFunc {
 	return func(ctxt AmContext) (string, any) {
+		// Cut the prefix off the path.
 		fname := ctxt.URLPath()
 		if strings.HasPrefix(fname, prefix) {
 			fname = fname[len(prefix):]
 		} else {
 			return "error", "invalid path name"
 		}
+		// Extract the basic MIME type.
 		mtype := mimeTypeFromFilename(fname)
+		p := strings.Index(mtype, ";")
+		if p >= 0 {
+			mtype = mtype[:p]
+		}
+		// Decide from there how to render it.
 		ctxt.VarMap().Set("mimeType", mtype)
 		switch mtype {
 		case "text/html":