Google says don’t use JavaScript to generate a noindex tag in the original page code

Google updated its JavaScript SEO basics documentation to clarify that may skip rendering and JavaScript execution.
InfoWorld

What’s new in Google’s V8 JavaScript engine Version 7

The beta V8 Version 7.4 is now available, with the potential to expand the engine’s footprint to platforms such as Apple iOS. V8 is Google’s open source JavaScript and WebAssembly engine for the ...
InfoWorld

Opera working on faster JavaScript engine

Carakan, intended to be world's fastest JavaScript engine, will be released in as-yet-undetermined version of the Opera browser Opera is working on a JavaScript engine, called Carakan, which is ...