diff --git a/README.md b/README.md
index 1cc4f2220..bdcdfccad 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 [![Basix CI](https://github.com/FEniCS/basix/actions/workflows/pythonapp.yml/badge.svg)](https://github.com/FEniCS/basix/actions/workflows/pythonapp.yml)
 [![Spack install](https://github.com/FEniCS/basix/actions/workflows/spack.yml/badge.svg)](https://github.com/FEniCS/basix/actions/workflows/spack.yml)
+[![DefElement verification](https://defelement.org/badges/basix.ufl.svg)](https://defelement.org/verification.html)
 
 Basix is a finite element definition and tabulation runtime library.
 Basix allows users to:
@@ -68,11 +69,11 @@ follows:
 
 The following elements are supported on an interval:
 
-  - [Lagrange](https://defelement.com/elements/lagrange.html)
-  - [Bubble](https://defelement.com/elements/bubble.html)
-  - [Serendipity](https://defelement.com/elements/serendipity.html)
-  - [Hermite](https://defelement.com/elements/hermite.html)
-  - [iso](https://defelement.com/elements/p1-iso-p2.html)
+  - [Lagrange](https://defelement.org/elements/lagrange.html)
+  - [Bubble](https://defelement.org/elements/bubble.html)
+  - [Serendipity](https://defelement.org/elements/serendipity.html)
+  - [Hermite](https://defelement.org/elements/hermite.html)
+  - [iso](https://defelement.org/elements/p1-iso-p2.html)
 
 
 ### Triangle
@@ -84,17 +85,17 @@ follows:
 
 The following elements are supported on a triangle:
 
-  - [Lagrange](https://defelement.com/elements/lagrange.html)
-  - [Nédélec first kind](https://defelement.com/elements/nedelec1.html)
-  - [Raviart-Thomas](https://defelement.com/elements/raviart-thomas.html)
-  - [Nédélec second kind](https://defelement.com/elements/nedelec2.html)
-  - [Brezzi-Douglas-Marini](https://defelement.com/elements/brezzi-douglas-marini.html)
-  - [Regge](https://defelement.com/elements/regge.html)
-  - [Hellan-Herrmann-Johnson](https://defelement.com/elements/hellan-hermann-johnson.html)
-  - [Crouzeix-Raviart](https://defelement.com/elements/crouzeix-raviart.html)
-  - [Bubble](https://defelement.com/elements/bubble.html)
-  - [Hermite](https://defelement.com/elements/hermite.html)
-  - [iso](https://defelement.com/elements/p1-iso-p2.html)
+  - [Lagrange](https://defelement.org/elements/lagrange.html)
+  - [Nédélec first kind](https://defelement.org/elements/nedelec1.html)
+  - [Raviart-Thomas](https://defelement.org/elements/raviart-thomas.html)
+  - [Nédélec second kind](https://defelement.org/elements/nedelec2.html)
+  - [Brezzi-Douglas-Marini](https://defelement.org/elements/brezzi-douglas-marini.html)
+  - [Regge](https://defelement.org/elements/regge.html)
+  - [Hellan-Herrmann-Johnson](https://defelement.org/elements/hellan-hermann-johnson.html)
+  - [Crouzeix-Raviart](https://defelement.org/elements/crouzeix-raviart.html)
+  - [Bubble](https://defelement.org/elements/bubble.html)
+  - [Hermite](https://defelement.org/elements/hermite.html)
+  - [iso](https://defelement.org/elements/p1-iso-p2.html)
 
 
 ### Quadrilateral
@@ -106,15 +107,15 @@ as follows:
 
 The following elements are supported on a quadrilateral:
 
-  - [Lagrange](https://defelement.com/elements/lagrange.html)
-  - [Nédélec first kind](https://defelement.com/elements/nedelec1.html)
-  - [Raviart-Thomas](https://defelement.com/elements/qdiv.html)
-  - [Nédélec second kind](https://defelement.com/elements/scurl.html)
-  - [Brezzi-Douglas-Marini](https://defelement.com/elements/sdiv.html)
-  - [Bubble](https://defelement.com/elements/bubble.html)
-  - [DPC](https://defelement.com/elements/dpc.html)
-  - [Serendipity](https://defelement.com/elements/serendipity.html)
-  - [iso](https://defelement.com/elements/p1-iso-p2.html)
+  - [Lagrange](https://defelement.org/elements/lagrange.html)
+  - [Nédélec first kind](https://defelement.org/elements/nedelec1.html)
+  - [Raviart-Thomas](https://defelement.org/elements/qdiv.html)
+  - [Nédélec second kind](https://defelement.org/elements/scurl.html)
+  - [Brezzi-Douglas-Marini](https://defelement.org/elements/sdiv.html)
+  - [Bubble](https://defelement.org/elements/bubble.html)
+  - [DPC](https://defelement.org/elements/dpc.html)
+  - [Serendipity](https://defelement.org/elements/serendipity.html)
+  - [iso](https://defelement.org/elements/p1-iso-p2.html)
 
 
 ### Tetrahedron
@@ -126,16 +127,16 @@ follows:
 
 The following elements are supported on a tetrahedron:
 
-  - [Lagrange](https://defelement.com/elements/lagrange.html)
-  - [Nédélec first kind](https://defelement.com/elements/nedelec1.html)
-  - [Raviart-Thomas](https://defelement.com/elements/raviart-thomas.html)
-  - [Nédélec second kind](https://defelement.com/elements/nedelec2.html)
-  - [Brezzi-Douglas-Marini](https://defelement.com/elements/brezzi-douglas-marini.html)
-  - [Regge](https://defelement.com/elements/regge.html)
-  - [Crouzeix-Raviart](https://defelement.com/elements/crouzeix-raviart.html)
-  - [Bubble](https://defelement.com/elements/bubble.html)
-  - [Hermite](https://defelement.com/elements/hermite.html)
-  - [iso](https://defelement.com/elements/p1-iso-p2.html)
+  - [Lagrange](https://defelement.org/elements/lagrange.html)
+  - [Nédélec first kind](https://defelement.org/elements/nedelec1.html)
+  - [Raviart-Thomas](https://defelement.org/elements/raviart-thomas.html)
+  - [Nédélec second kind](https://defelement.org/elements/nedelec2.html)
+  - [Brezzi-Douglas-Marini](https://defelement.org/elements/brezzi-douglas-marini.html)
+  - [Regge](https://defelement.org/elements/regge.html)
+  - [Crouzeix-Raviart](https://defelement.org/elements/crouzeix-raviart.html)
+  - [Bubble](https://defelement.org/elements/bubble.html)
+  - [Hermite](https://defelement.org/elements/hermite.html)
+  - [iso](https://defelement.org/elements/p1-iso-p2.html)
 
 
 ### Hexahedron
@@ -147,15 +148,15 @@ follows:
 
 The following elements are supported on a hexahedron:
 
-  - [Lagrange](https://defelement.com/elements/lagrange.html)
-  - [Nédélec first kind](https://defelement.com/elements/nedelec1.html)
-  - [Raviart-Thomas](https://defelement.com/elements/qdiv.html)
-  - [Nédélec second kind](https://defelement.com/elements/scurl.html)
-  - [Brezzi-Douglas-Marini](https://defelement.com/elements/sdiv.html)
-  - [Bubble](https://defelement.com/elements/bubble.html)
-  - [DPC](https://defelement.com/elements/dpc.html)
-  - [Serendipity](https://defelement.com/elements/serendipity.html)
-  - [iso](https://defelement.com/elements/p1-iso-p2.html)
+  - [Lagrange](https://defelement.org/elements/lagrange.html)
+  - [Nédélec first kind](https://defelement.org/elements/nedelec1.html)
+  - [Raviart-Thomas](https://defelement.org/elements/qdiv.html)
+  - [Nédélec second kind](https://defelement.org/elements/scurl.html)
+  - [Brezzi-Douglas-Marini](https://defelement.org/elements/sdiv.html)
+  - [Bubble](https://defelement.org/elements/bubble.html)
+  - [DPC](https://defelement.org/elements/dpc.html)
+  - [Serendipity](https://defelement.org/elements/serendipity.html)
+  - [iso](https://defelement.org/elements/p1-iso-p2.html)
 
 
 ### Prism
@@ -167,7 +168,7 @@ follows:
 
 The following elements are supported on a prism:
 
-  - [Lagrange](https://defelement.com/elements/lagrange.html)
+  - [Lagrange](https://defelement.org/elements/lagrange.html)
 
 
 ### Pyramid
@@ -179,4 +180,4 @@ follows:
 
 The following elements are supported on a pyramid:
 
-  - [Lagrange](https://defelement.com/elements/lagrange.html)
+  - [Lagrange](https://defelement.org/elements/lagrange.html)
diff --git a/cpp/basix/finite-element.h b/cpp/basix/finite-element.h
index fc7188198..e65ad8769 100644
--- a/cpp/basix/finite-element.h
+++ b/cpp/basix/finite-element.h
@@ -142,6 +142,9 @@ class FiniteElement
       T, MDSPAN_IMPL_STANDARD_NAMESPACE::dextents<std::size_t, d>>;
 
 public:
+  /// Scalar type.
+  using scalar_type = F;
+
   /// @brief Construct a finite element.
   ///
   /// Initialising a finite element calculates the basis functions of
diff --git a/demo/python/demo_custom_element.py b/demo/python/demo_custom_element.py
index 27d9fb178..5f0ae0875 100644
--- a/demo/python/demo_custom_element.py
+++ b/demo/python/demo_custom_element.py
@@ -182,7 +182,7 @@
 #
 # As a second example, we create a degree 1 Raviart--Thomas element on a triangle. Details of
 # the definition of this element can be found at
-# https://defelement.com/elements/raviart-thomas.html. This element
+# https://defelement.org/elements/raviart-thomas.html. This element
 # spans:
 #
 # .. math::
diff --git a/demo/python/demo_custom_element_conforming_cr.py b/demo/python/demo_custom_element_conforming_cr.py
index 4ee3b5231..bf951ae6a 100644
--- a/demo/python/demo_custom_element_conforming_cr.py
+++ b/demo/python/demo_custom_element_conforming_cr.py
@@ -20,7 +20,7 @@
 # We begin by implementing this element on a triangle. The following function
 # implements this element for an arbitrary degree. Details of the definition of
 # this element can be found at
-# https://defelement.com/elements/conforming-crouzeix-raviart.html.
+# https://defelement.org/elements/conforming-crouzeix-raviart.html.
 #
 # As the input to this function, we use the degree of the element as shown on
 # DefElement. For most degrees, the highest degree polynomial in this elements