diff --git a/examples/1ptracer/doc/1pmodel.md b/examples/1ptracer/doc/1pmodel.md
index 62e42912b48aa9709754ab9dde3ce585061182be..c2a6499bfb344d90fe2a3fcc96f48b4abf2cb5c8 100644
--- a/examples/1ptracer/doc/1pmodel.md
+++ b/examples/1ptracer/doc/1pmodel.md
@@ -26,6 +26,11 @@ The documentation provided in the sequel is structured as follows:
 In this file, the type tag used for the single-phase flow simulation is defined,
 for which we then specialize `properties` to the needs of the desired setup.
 
+
+<details open>
+<summary><b>Click to hide/show the file documentation</b> (or inspect the [source code](../properties_1p.hh))</summary>
+
+
 ### Includes
 <details><summary> Click to show includes</summary>
 
@@ -174,6 +179,8 @@ struct EnableGridGeometryCache<TypeTag, TTag::IncompressibleTest> { static const
 
 </details>
 
+</details>
+
 
 
 ## Initial and boundary conditions (`problem_1p.hh`)
@@ -181,6 +188,11 @@ struct EnableGridGeometryCache<TypeTag, TTag::IncompressibleTest> { static const
 This file contains the __problem class__ which defines the initial and boundary
 conditions for the single-phase flow simulation.
 
+
+<details open>
+<summary><b>Click to hide/show the file documentation</b> (or inspect the [source code](../problem_1p.hh))</summary>
+
+
 ### Include files
 
 The only include we need here is the `PorousMediumFlowProblem` class, the base
@@ -277,15 +289,21 @@ Fluid properties that depend on temperature will be calculated with this value.
 ```
 
 
+</details>
 
 
-## Parameter distributions (`spatialparams_1p.hh`)
 
+## Parameter distributions (`spatialparams_1p.hh`)
 
 This file contains the __spatial parameters class__ which defines the
 distributions for the porous medium parameters permeability and porosity
 over the computational grid
 
+
+<details open>
+<summary><b>Click to hide/show the file documentation</b> (or inspect the [source code](../spatialparams_1p.hh))</summary>
+
+
 ### Include files
 In this example, we use a randomly generated and element-wise distributed
 permeability field. For this, we use the random number generation facilities
@@ -440,6 +458,8 @@ private:
 
 </details>
 
+</details>
+
 
 | [:arrow_left: Back to the main documentation](../README.md) | [:arrow_right: Continue with part 2](tracermodel.md) |
 |---|---:|
diff --git a/examples/1ptracer/doc/main.md b/examples/1ptracer/doc/main.md
index e5981888b3c4bf5a8e1852cabb61e06df7055a6e..ab4ce550f9a96579cade4025c52c18ee01493c75 100644
--- a/examples/1ptracer/doc/main.md
+++ b/examples/1ptracer/doc/main.md
@@ -14,6 +14,12 @@ This file contains the main program flow. In this example, we solve a single-pha
 to obtain a pressure distribution in the domain. Subsequently, the distribution of volume fluxes
 is computed from that pressure distribution, which is then passed to a tracer problem to solve
 the transport of an initial contamination through the model domain.
+
+
+<details open>
+<summary><b>Click to hide/show the file documentation</b> (or inspect the [source code](../main.cc))</summary>
+
+
 ## Included header files
 <details>
 These are DUNE helper classes related to parallel computations, time measurements and file I/O
@@ -412,6 +418,8 @@ catch (...)
 
 </details>
 
+</details>
+
 
 | [:arrow_left: Back to the main documentation](../README.md) | [:arrow_left: Go back to part 2](tracermodel.md) |
 |---|---:|
diff --git a/examples/1ptracer/doc/tracermodel.md b/examples/1ptracer/doc/tracermodel.md
index d6b67a1f7ebca13af696be7c8cfb6b45c922084a..12255a59d1756c68a23918b80a338eb769211428 100644
--- a/examples/1ptracer/doc/tracermodel.md
+++ b/examples/1ptracer/doc/tracermodel.md
@@ -26,6 +26,11 @@ The documentation provided in the sequel is structured as follows:
 This file defines the type tag used for the tracer transport simulation, for
 which we then specialize `properties` to the needs of the desired setup.
 
+
+<details open>
+<summary><b>Click to hide/show the file documentation</b> (or inspect the [source code](../properties_tracer.hh))</summary>
+
+
 ### Include files
 <details>
 As for the single-phase problem, atype tag is defined also for this simulation.
@@ -213,6 +218,8 @@ struct SolutionDependentMolecularDiffusion<TypeTag, TTag::TracerTest>
 
 </details>
 
+</details>
+
 
 
 ## Initial and boundary conditions (`problem_tracer.hh`)
@@ -220,6 +227,11 @@ struct SolutionDependentMolecularDiffusion<TypeTag, TTag::TracerTest>
 This file contains the __problem class__ which defines the initial and boundary
 conditions for the tracer transport simulation.
 
+
+<details open>
+<summary><b>Click to hide/show the file documentation</b> (or inspect the [source code](../problem_tracer.hh))</summary>
+
+
 ### Include files
 The only include we need here is the `PorousMediumFlowProblem` class, the base
 class for Problems from which we will derive.
@@ -364,6 +376,8 @@ private:
 ```
 
 
+</details>
+
 
 
 ## Parameter distributions (`spatialparams_tracer.hh`)
@@ -374,6 +388,11 @@ and porosity in various functions for the tracer problem. Furthermore, spatially
 properties of the tracer fluid system are defined as well as functions related to setting
 and retrieving the volume fluxes calculated from the solution of the 1p problem.
 
+
+<details open>
+<summary><b>Click to hide/show the file documentation</b> (or inspect the [source code](../spatialparams_tracer.hh))</summary>
+
+
 ### Include files
 We include the spatial parameters class for single-phase models discretized by
 finite volume schemes, from which the spatial parameters defined for this example will inherit.
@@ -499,6 +518,8 @@ private:
 ```
 
 
+</details>
+
 
 | [:arrow_left: Back to the main documentation](../README.md) | [:arrow_left: Go back to part 1](1pmodel.md) | [:arrow_right: Continue with part 3](main.md) |
 |---|---|---:|
diff --git a/examples/1ptracer/main.cc b/examples/1ptracer/main.cc
index 0123a8c875a967c4b1c743477d9ddb51b58ee2bd..6cfb1c741b4bd3717c65ac305280e7da2cb0be60 100644
--- a/examples/1ptracer/main.cc
+++ b/examples/1ptracer/main.cc
@@ -24,6 +24,9 @@
 // to obtain a pressure distribution in the domain. Subsequently, the distribution of volume fluxes
 // is computed from that pressure distribution, which is then passed to a tracer problem to solve
 // the transport of an initial contamination through the model domain.
+//
+// [[content]]
+//
 // ## Included header files
 // <details>
 // [[exclude]]
@@ -369,3 +372,4 @@ catch (...)
 }
 // [[/codeblock]]
 // </details>
+// [[/content]]
diff --git a/examples/1ptracer/problem_1p.hh b/examples/1ptracer/problem_1p.hh
index e472c418c9fd09d698610648c9abe68c3d7dad90..858d768c20e18d7cda510a827d319f441635c007 100644
--- a/examples/1ptracer/problem_1p.hh
+++ b/examples/1ptracer/problem_1p.hh
@@ -25,6 +25,8 @@
 // This file contains the __problem class__ which defines the initial and boundary
 // conditions for the single-phase flow simulation.
 //
+// [[content]]
+//
 // ### Include files
 //
 // The only include we need here is the `PorousMediumFlowProblem` class, the base
@@ -112,5 +114,5 @@ public:
 }; // end class definition of OnePTestProblem
 } // end namespace Dumux
 // [[/codeblock]]
-
+// [[/content]]
 #endif
diff --git a/examples/1ptracer/problem_tracer.hh b/examples/1ptracer/problem_tracer.hh
index ae6efb07b06aab4cfecaa0df594aa7671c496e7b..0329500f909fe9cae343912d00e4ce03fbcf95d8 100644
--- a/examples/1ptracer/problem_tracer.hh
+++ b/examples/1ptracer/problem_tracer.hh
@@ -25,6 +25,8 @@
 // This file contains the __problem class__ which defines the initial and boundary
 // conditions for the tracer transport simulation.
 //
+// [[content]]
+//
 // ### Include files
 // The only include we need here is the `PorousMediumFlowProblem` class, the base
 // class for Problems from which we will derive.
@@ -158,5 +160,5 @@ private:
 }; // end class definition TracerTestProblem
 } // end namespace Dumux
 // [[/codeblock]]
-
+// [[/content]]
 #endif
diff --git a/examples/1ptracer/properties_1p.hh b/examples/1ptracer/properties_1p.hh
index 0cbbe1993ac37f635ef9120baece677069ffa08e..50dffaa884fd9463cbe6008ed5b1b2f0bf7dc756 100644
--- a/examples/1ptracer/properties_1p.hh
+++ b/examples/1ptracer/properties_1p.hh
@@ -25,6 +25,8 @@
 // In this file, the type tag used for the single-phase flow simulation is defined,
 // for which we then specialize `properties` to the needs of the desired setup.
 //
+// [[content]]
+//
 // ### Includes
 // [[details]] includes
 //
@@ -143,5 +145,5 @@ struct EnableGridGeometryCache<TypeTag, TTag::IncompressibleTest> { static const
 } // end namespace Dumux::Properties
 // [[/codeblock]]
 // </details>
-
+// [[/content]]
 #endif
diff --git a/examples/1ptracer/properties_tracer.hh b/examples/1ptracer/properties_tracer.hh
index 1cdc157553fd6b6f41945652b518faa5600ee4a7..6b3b09fe2e4437b4a3ee970a8e95726735040509 100644
--- a/examples/1ptracer/properties_tracer.hh
+++ b/examples/1ptracer/properties_tracer.hh
@@ -25,6 +25,8 @@
 // This file defines the type tag used for the tracer transport simulation, for
 // which we then specialize `properties` to the needs of the desired setup.
 //
+// [[content]]
+//
 // ### Include files
 // <details>
 // As for the single-phase problem, atype tag is defined also for this simulation.
@@ -182,5 +184,5 @@ struct SolutionDependentMolecularDiffusion<TypeTag, TTag::TracerTest>
 } // end namespace Dumux
 // [[/codeblock]]
 // </details>
-
+// [[/content]]
 #endif
diff --git a/examples/1ptracer/spatialparams_1p.hh b/examples/1ptracer/spatialparams_1p.hh
index 07d8f57ba3e880081844b8b89631b6cd13c95331..62d6208a3d23cb728323e9597477e102f20dff75 100644
--- a/examples/1ptracer/spatialparams_1p.hh
+++ b/examples/1ptracer/spatialparams_1p.hh
@@ -22,11 +22,12 @@
 
 // ## Parameter distributions (`spatialparams_1p.hh`)
 //
-//
 // This file contains the __spatial parameters class__ which defines the
 // distributions for the porous medium parameters permeability and porosity
 // over the computational grid
 //
+// [[content]]
+//
 // ### Include files
 // In this example, we use a randomly generated and element-wise distributed
 // permeability field. For this, we use the random number generation facilities
@@ -159,4 +160,5 @@ private:
 } // end namespace Dumux
 // [[/codeblock]]
 // </details>
+// [[/content]]
 #endif
diff --git a/examples/1ptracer/spatialparams_tracer.hh b/examples/1ptracer/spatialparams_tracer.hh
index 710acb59b8d4af246ca8ab89c436802e6e144aa8..103ebda4eb2db7506fb7b02553a2eb57f7187cc4 100644
--- a/examples/1ptracer/spatialparams_tracer.hh
+++ b/examples/1ptracer/spatialparams_tracer.hh
@@ -28,6 +28,8 @@
 // properties of the tracer fluid system are defined as well as functions related to setting
 // and retrieving the volume fluxes calculated from the solution of the 1p problem.
 //
+// [[content]]
+//
 // ### Include files
 // We include the spatial parameters class for single-phase models discretized by
 // finite volume schemes, from which the spatial parameters defined for this example will inherit.
@@ -128,5 +130,5 @@ private:
 }; // end class definition TracerTestSpatialParams
 } // end namespace Dumux
 // [[/codeblock]]
-
+// [[/content]]
 #endif