Small adjustments + add backtrace section with gif

Author: nekevss

blog/boa-release-21/img/backtrace.gif

@@ -55,16 +55,24 @@ cargo add temporal_rs
 
 #### Special thanks
 
-Special thanks to all the student's from University of Bergen as well as
-Shane Carr ([@sffc](https://github.com/@sffc)) and Manish Goregaokar
-([@manishearth](https://github.com/@manishearth)) from ICU4X for their
-contributions and help with `temporal_rs`.
+Special thanks to all the student's from University of Bergen who helped contribute to
+`temporal_rs` and Boa, as well as Shane Carr ([@sffc](https://github.com/@sffc)) and
+Manish Goregaokar ([@manishearth](https://github.com/@manishearth)) for their contributions
+and help with `temporal_rs`.
+
+### Span nodes and error backtraces
+
+We also closed an outstanding issue of supporting span nodes in our parser and AST. This
+allowed us to implement backtraces to provide better debugging information when using
+Boa.
+
+![backtrace-example](./img/backtrace.gif)
 
 ### New Set methods
 
-Boa now supports the new set methods added in ES2025.
+This release adds support for the new set methods added in ES2025.
 
-These new methods are:
+The new methods are:
 
 - `Set.prototype.intersection(other)`
 - `Set.prototype.union(other)`
@@ -79,7 +87,7 @@ their work on this feature.
 
 ### Float16 support for TypedArrays, Dataview and Math built-ins
 
-Boa now supports `f16` types for the TypedArray, Dataview, and Math
+This release adds support for `f16` types for the TypedArray, Dataview, and Math
 built-ins.
 
 ```javascript
@@ -89,15 +97,18 @@ console.log(x[1]); // 42
 
 ### Error.isError
 
-Boa now supports `Error.isError`, which is accepted for ES2026.
+This release adds support for `Error.isError`, which is accepted for ES2026.
 
 ```javascript
 let check = Error.isError(new Error()); // returns true
 ```
 
 ### Math.sumPrecise
 
-Boa now supports `Math.sumPrecise`, which is accepted for ES2026.
+This release adds support for `Math.sumPrecise`, which is accepted for ES2026.
+
+We've opted for using the new [`xsum`](https://crates.io/crates/xsum) summation algorithm
+for the underlying implementation.
 
 ```javascript
 let sum = Math.sumPrecise([1.0, 2.5]);
@@ -130,6 +141,8 @@ against the Web Platform Tests (WPT).
 With this release, Boa's virtual machine (VM) moved from a stack based
 VM to a register based VM.
 
+TODO: Potentially add more here
+
 ## New Contributors
 
 TODO

blog/boa-release-21.md renamed to blog/boa-release-21/index.md

@@ -0,0 +1,30 @@
+# Below is a VHS tape file
+Output backtrace.gif
+
+# Setup env
+Hide
+
+Set TypingSpeed 50ms
+Set Theme "GruvboxDark"
+
+# boa_cli needs to be installed for the tape to run.
+Require boa
+
+Show
+
+Type@100ms `echo "const oops = () => { throw new Error() }; oops();" > yikes.js `
+
+Enter
+
+Type@100ms "boa yikes.js"
+
+Enter
+
+Sleep 4s
+
+Hide
+
+Type "rm yikes.js"
+
+Enter
+