CONSOLE MESSAGE: line 21: video loaded
CONSOLE MESSAGE: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/text-track-blocked.html from loading a resource from http://127.0.0.1:8000/media-resources/track/captions-webvtt/captions-fast.vtt
CONSOLE MESSAGE: line 14: vttError
layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
      RenderText {#text} at (0,0) size 262x18
        text run at (0,0) width 262: "The following text track should not load."
      RenderBR {BR} at (261,14) size 1x0
      RenderText {#text} at (0,0) size 0x0
layer at (8,26) size 320x240
  RenderVideo {VIDEO} at (0,18) size 320x240
layer at (8,26) size 320x240
  RenderBlock (relative positioned) {DIV} at (0,0) size 320x240
layer at (8,26) size 320x240
  RenderBlock (positioned) {DIV} at (0,0) size 320x240