diff --git a/webapp/api_handlers.go b/webapp/api_handlers.go
index dedeb85256c..e0dc2d8922f 100644
--- a/webapp/api_handlers.go
+++ b/webapp/api_handlers.go
@@ -11,6 +11,7 @@ import (
 	"net/http"
 	"net/url"
 	"strconv"
+	"strings"
 	"time"
 
 	models "github.com/web-platform-tests/wpt.fyi/shared"
@@ -48,6 +49,9 @@ func apiTestRunsHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	labels := ParseLabelsParam(r)
+	unstable := labels != nil && labels.Contains("unstable")
+
 	var testRuns []models.TestRun
 	var limit int
 	if limit, err = ParseMaxCountParam(r); err != nil {
@@ -61,6 +65,9 @@ func apiTestRunsHandler(w http.ResponseWriter, r *http.Request) {
 
 	for _, browserName := range browserNames {
 		var testRunResults []models.TestRun
+		if unstable {
+			browserName = browserName + "-experimental"
+		}
 		query := baseQuery.Filter("BrowserName =", browserName)
 		if runSHA != "" && runSHA != "latest" {
 			query = query.Filter("Revision =", runSHA)
@@ -69,6 +76,11 @@ func apiTestRunsHandler(w http.ResponseWriter, r *http.Request) {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return
 		}
+		if unstable {
+			for i := range testRunResults {
+				testRunResults[i].BrowserName = strings.Replace(testRunResults[i].BrowserName, "-experimental", "", 1)
+			}
+		}
 		testRuns = append(testRuns, testRunResults...)
 	}
 
diff --git a/webapp/params.go b/webapp/params.go
index de8469d7dcf..6c0f087fb2d 100644
--- a/webapp/params.go
+++ b/webapp/params.go
@@ -190,3 +190,30 @@ func ParsePathsParam(r *http.Request) (paths mapset.Set) {
 	}
 	return paths
 }
+
+// ParseLabelsParam returns a set list of test-run labels to include, or nil if
+// no labels are provided.
+func ParseLabelsParam(r *http.Request) (labels mapset.Set) {
+	labelParams := r.URL.Query()["label"]
+	labelsParam := r.URL.Query().Get("labels")
+	if len(labelParams) == 0 && labelsParam == "" {
+		return nil
+	}
+
+	labels = mapset.NewSet()
+	for _, label := range labelParams {
+		labels.Add(label)
+	}
+	if labelsParam != "" {
+		for _, label := range strings.Split(labelsParam, ",") {
+			labels.Add(label)
+		}
+	}
+	if labels.Contains("") {
+		labels.Remove("")
+	}
+	if labels.Cardinality() == 0 {
+		return nil
+	}
+	return labels
+}
diff --git a/webapp/test_results_handler.go b/webapp/test_results_handler.go
index f8469686dc0..ef7429c55d3 100644
--- a/webapp/test_results_handler.go
+++ b/webapp/test_results_handler.go
@@ -119,7 +119,13 @@ func getTestRunsAndSources(r *http.Request, runSHA string) (testRunSources []str
 			testRunSources = append(testRunSources, fmt.Sprintf(singleRunURL, afterSpec.Revision, afterSpec.Platform))
 		}
 	} else {
-		const sourceURL = `/api/runs?sha=%s`
+		var sourceURL = `/api/runs?sha=%s`
+		labels := ParseLabelsParam(r)
+		if labels != nil {
+			for label := range labels.Iterator().C {
+				sourceURL = sourceURL + "&label=" + label.(string)
+			}
+		}
 		testRunSources = []string{fmt.Sprintf(sourceURL, runSHA)}
 	}
 
diff --git a/webapp/test_run_handler.go b/webapp/test_run_handler.go
index a3f827fdb15..eec0fc779ce 100644
--- a/webapp/test_run_handler.go
+++ b/webapp/test_run_handler.go
@@ -31,6 +31,13 @@ func handleTestRunGet(w http.ResponseWriter, r *http.Request) {
 	}
 	sourceURL := fmt.Sprintf(`/api/runs?max-count=%d`, maxCount)
 
+	labels := ParseLabelsParam(r)
+	if labels != nil {
+		for label := range labels.Iterator().C {
+			sourceURL = sourceURL + "&label=" + label.(string)
+		}
+	}
+
 	// Serialize the data + pipe through the test-runs.html template.
 	testRunSourcesBytes, err := json.Marshal([]string{sourceURL})
 	if err != nil {