Squashed commit of the following:

commit ddd4a9145fb903eba795f3dea9402268a099e651
Author: Tom <thomas.hodson@ecmwf.int>
Date:   Sun Feb 16 18:26:06 2025 +0000

    Make executable code snippets post

_posts/2025-02-16-executable-code-snippets-in-docs-and-html-object-representations.md

@@ -0,0 +1,99 @@
+---
+title: Executable code snippets in docs and HTML object representations
+layout: post
+excerpt: "It just looks so nice."
+
+assets: /assets/blog/executable-code-snippets-in-docs-and-html-object-representations
+thumbnail: /assets/blog/executable-code-snippets-in-docs-and-html-object-representations/thumbnail.png
+social_image: /assets/blog/executable-code-snippets-in-docs-and-html-object-representations/thumbnail.png
+alt:
+image_class: invertable
+
+
+---
+
+Just a quick one. Lately I've started writing the documention for [a new software project involving trees](https://qubed.readthedocs.io). 
+
+While debugging that in a Jupyter notebook I made a small HTML representation of the tree that mimis the output of `tree` but using the HTML details tag so you can open and close the subtrees.
+
+This works using by giving the object a "_repr_html_" method that returns a HTML string. If it's present, Jupyter notebooks will use the output of that instead of `repr` to display a rich version of the object in a notebook.
+
+```python
+class Title():
+    def __init__(self, x):
+        self.x = x
+    def _repr_html_(self):
+        return f"<h1>{self.x}</h1>"
+```
+
+I then set up executable code snippets in these docs so I could give code examples and not have to paste the output in myself. I'm using MyST-NB in sphinx to do this, it gives you a nicely syntax highlighted code block along with the output evaluated against the actual code.  Since the NB in Myst-NB stands for notebook, it's perhaps not so surprising that the HTML inline output also works!
+
+The overall effect looks a bit like the below but see it [in place](https://qubed.readthedocs.io) for a better idea of how it looks with proper CSS.
+
+```python
+from qubed import Qube
+
+q = Qube.from_dict({
+    "class=od" : {
+        "expver=0001": {"param=1":{}, "param=2":{}},
+        "expver=0002": {"param=1":{}, "param=2":{}},
+    },
+    "class=rd" : {
+        "expver=0001": {"param=1":{}, "param=2":{}, "param=3":{}},
+        "expver=0002": {"param=1":{}, "param=2":{}},
+    },
+})
+
+# depth controls how much of the tree is open when rendered as html.
+q.html(depth=100)
+```
+<div class="output text_html">
+        <style>
+        pre#qubed-tree-555631 {
+            font-family: monospace;
+            white-space: pre;
+            font-family: SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,Courier,monospace;
+            font-size: 12px;
+            line-height: 1.4;
+            
+            details {
+                margin-left: 0;
+            }
+
+            summary {
+                list-style: none;
+                cursor: pointer;
+                text-overflow: ellipsis;
+                overflow: hidden;
+                text-wrap: nowrap;
+                display: block;
+            }
+
+            summary:hover,span.leaf:hover {
+                background-color: #f0f0f0;
+            }
+
+            details > summary::after {
+                content: ' ▲';
+            }
+
+            details:not([open]) > summary::after {
+                content: " ▼";
+            }
+
+            .leaf {
+                text-overflow: ellipsis;
+                overflow: hidden;
+                text-wrap: nowrap;
+                display: block;
+            }
+
+            summary::-webkit-details-marker {
+              display: none; 
+              content: "";
+            }
+
+        }
+        </style>
+        <pre class="qubed-tree" id="qubed-tree-555631"><details open=""><summary>root</summary><details open=""><summary>├── class=od</summary><details open=""><summary>│   ├── expver=0001</summary><span class="leaf">│   │   ├── param=1</span><span class="leaf">│   │   └── param=2</span></details><details open=""><summary>│   └── expver=0002</summary><span class="leaf">│       ├── param=1</span><span class="leaf">│       └── param=2</span></details></details><details open=""><summary>└── class=rd</summary><details open=""><summary>    ├── expver=0001</summary><span class="leaf">    │   ├── param=1</span><span class="leaf">    │   ├── param=2</span><span class="leaf">    │   └── param=3</span></details><details open=""><summary>    └── expver=0002</summary><span class="leaf">        ├── param=1</span><span class="leaf">        └── param=2</span></details></details></details></pre></div></div>
+</div>

_sass/base.scss

@@ -32,6 +32,7 @@
   --theme-model-line-color: #222;
   --theme-model-bg-color: #fcfcfc;
   --theme-subtle-outline: oklch(90% 0 50);
+  --theme-subtle-background: rgba(128, 128, 128, 0.05);
   --theme-highlight-color: hsl(338, 75%, 60%);
   --theme-highlight-color-transparent: hsla(338, 75%, 60%, 33%);
   --theme-subtle-text-color: #606984;
@@ -291,7 +292,25 @@ section.center {
   margin-bottom: 1em;
 }
 
-div.CodeRay,
+div.CodeRay {
+  font-family: SFMono-Regular, Menlo, Monaco, Consolas, Liberation Mono,
+    Courier New, Courier, monospace;
+  font-size: 12px;
+  line-height: 1.4;
+  padding: 1em;
+  background-color: var(--theme-subtle-background);
+  border-radius: 5px;
+
+  // Override background colors from the theme.
+  span {
+    background-color: unset !important;
+  }
+
+  pre {
+    text-wrap: auto;
+    margin: 0;
+  }
+
   .wide-outside-parent {
     // width: 100vw;
     position: relative;
@@ -311,6 +330,7 @@ div.CodeRay,
       }
     }
   }
+}
 
 // If the browser doesn't support web components, hide anything with has-wc class
 body.has-wc .no-wc {
@@ -389,6 +409,7 @@ svg {
     --theme-text-color: #fcfcfc;
     --theme-bg-color: #222;
     --theme-subtle-outline: oklch(50% 0 50);
+    --theme-subtle-background: rgba(255, 255, 255, 0.05);
   }
 
   // Two main image classes are "invertable" i.e look good inverted

_sass/code_style_github.scss

@@ -1,5 +1,16 @@
-.highlight table td { padding: 5px; }
-.highlight table pre { margin: 0; }
+.highlight {
+  font-family: SFMono-Regular, Menlo, Monaco, Consolas, Liberation Mono,
+    Courier New, Courier, monospace;
+  font-size: 12px;
+  line-height: 1.4;
+}
+
+.highlight table td {
+  padding: 5px;
+}
+.highlight table pre {
+  margin: 0;
+}
 .highlight .cm {
   color: #999988;
   font-style: italic;
@@ -17,7 +28,10 @@
   font-weight: bold;
   font-style: italic;
 }
-.highlight .c, .highlight .ch, .highlight .cd, .highlight .cpf {
+.highlight .c,
+.highlight .ch,
+.highlight .cd,
+.highlight .cpf {
   color: #999988;
   font-style: italic;
 }
@@ -82,7 +96,8 @@
   color: #445588;
   font-weight: bold;
 }
-.highlight .k, .highlight .kv {
+.highlight .k,
+.highlight .kv {
   color: #000000;
   font-weight: bold;
 }
@@ -101,7 +116,9 @@
 .highlight .mo {
   color: #009999;
 }
-.highlight .m, .highlight .mb, .highlight .mx {
+.highlight .m,
+.highlight .mb,
+.highlight .mx {
   color: #009999;
 }
 .highlight .sa {
@@ -141,7 +158,8 @@
 .highlight .ss {
   color: #990073;
 }
-.highlight .s, .highlight .dl {
+.highlight .s,
+.highlight .dl {
   color: #d14;
 }
 .highlight .na {
@@ -151,7 +169,7 @@
   color: #999999;
 }
 .highlight .nb {
-  color: #0086B3;
+  color: #0086b3;
 }
 .highlight .nc {
   color: #445588;
@@ -171,7 +189,8 @@
   color: #990000;
   font-weight: bold;
 }
-.highlight .nf, .highlight .fm {
+.highlight .nf,
+.highlight .fm {
   color: #990000;
   font-weight: bold;
 }
@@ -194,7 +213,8 @@
 .highlight .vi {
   color: #008080;
 }
-.highlight .nv, .highlight .vm {
+.highlight .nv,
+.highlight .vm {
   color: #008080;
 }
 .highlight .ow {