Client-side web programming currently means using technologies embedded in web browsers to run computations on the client computer. Most solutions imply using JavaScript which allows to describe computations, and modifications of the DOM displayed by the browser. However, JavaScript limits static checking as everything (types, names, etc.) is checked at runtime. Moreover its concurrent model does not take advantage of multi-core or GPU architectures. In this paper we present WebSPOC, an adapted version of the SPOC library for web applications. SPOC is an OCaml GPGPU library focusing on abstracting memory transfers and handling GPGPU computations in a strongly static typed context. SPOC proposes a specific language, called Sarek, to express kernels and different parallel skeletons to compose them. To run SPOC programs on the Web client side, its OCaml part is compiled to JavaScript code and its Sarek part to kernels running on GPUs or multi-core CPUs.