I'm planning to build a WebGL-based fluid simulation using the Navier-Stokes equations in a single HTML file, deciding between WebGL2 with float textures or WebGL1 with appropriate extensions, and falling back to a CPU simulation if needed.

Writing shader code... I can't test this in Node since WebGL won't run there, but I'll add a syntax check by extracting and parsing the script with Node. For the advection shader, I'll handle the linear filtering requirement by including a manual bilinear interpolation fallback via a define, keeping it simple rather than adding unnecessary complexity.

I'm planning a WebGL fluid simulation using the stable fluids approach with Navier-Stokes equations. I'll use WebGL2 with float texture support via the color buffer extension, and build out the core shaders for advection, divergence calculation, pressure solving with Jacobi iteration, gradient subtraction, and splat operations, then render the result to the screen.