diff --git a/utils/html/doc.py b/utils/html/doc.py
index d1ed888..e9fcc9e 100644
--- a/utils/html/doc.py
+++ b/utils/html/doc.py
@@ -7,7 +7,7 @@
 class Viewport(Options):
     default_values = {
         "width": "device-width",
-        "initial_scale": 1.0,
+        "initial-scale": 1.0,
     }
     
     template = "%s=%s"
@@ -48,7 +48,7 @@ def meta(self):
         
         l = self.libs
         
-        if len(l) == 0:
+        if l is None or len(l) == 0:
             l = ""
         else:
             l = t.div(id="libraries")
diff --git a/utils/html/jslibs.py b/utils/html/jslibs.py
index 33b8738..a732795 100644
--- a/utils/html/jslibs.py
+++ b/utils/html/jslibs.py
@@ -11,7 +11,7 @@ class JSLib(Library):
     )
     
     def __init__(self, path, *args, **kwargs):
-        self._async = bool(kwargs.get("async", True))
+        self._async = bool(kwargs.get("_async_", True))
         
         Library.__init__(self, path, *args, **kwargs)
     
@@ -34,6 +34,19 @@ def add(self, **kwargs):
         path="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js",
         integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6",
         crossorigin="anonymous",
+        _async_=False,
+    ),
+    bs_jquery=JSLib(
+        path="https://code.jquery.com/jquery-3.4.1.slim.min.js",
+        integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n",
+        crossorigin="anonymous",
+        _async_=False,
+    ),
+    bs_popper = JSLib(
+        path="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js",
+        integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo",
+        crossorigin="anonymous",
+        _async_=False,
     ),
 )
 
diff --git a/utils/html/tag.py b/utils/html/tag.py
index ee21a58..cdcea71 100644
--- a/utils/html/tag.py
+++ b/utils/html/tag.py
@@ -159,7 +159,7 @@ def doi(number, **kwargs):
 def collapsable(name, id, **kwargs):
     b = t.button(name, **{
         "data-toggle":"collapse",
-        "data_target":id
+        "data-target":"#%s" % id,
     })
     
     d = t.div(id=id, klass="collapse")