anchor.diff:      Div [ Width (string width); Attr.Style "float:left" ] -< [
         Div [ Attr.Style "float:center" ] -< [
           element
  +        |>! OnMouseMove (movePlayerShip element playerShip)
         ]
       ]
   
  
positive.code:     ctx.Fill()
  
    [<JavaScript>]
    let animatedCanvas width height =
  
      // キャンバスの設定
      let element = Tags.NewTag "Canvas" []
  
negative.code: ﻿namespace ShootingWebSharper
  
  open System.Net
  open IntelliFactory.WebSharper
  open IntelliFactory.WebSharper.Html
  open IntelliFactory.WebSharper.Html5
  open IntelliFactory.WebSharper.JQuery
  
  module ShootingGame =
  
    type PlayerShip = {
      x : float
      y : float
    }
  
    [<JavaScript>]
    let width = 300
  