HTMLPurifier syntax issue -

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I am using HTMLPurifier with this configuration: 

  case 'comment' : $ config = HTMLPurifier_Config :: createDefault (); Config- & gt; Set ('core. Encoding', 'utf-8'); $ Config- & gt; Set ('HTML.Allowed', 'iframe [src | width | height | frameborder | acceptable screen], p [style], p, br, hr, center, em, u, ul, li, font, ol, div [class] | Style], span [style], blockquote, strike, b, strong, img [src | alt | class | height | width], a [href | rel], object [width | height | data], absolute [name | Value], embed [source | type | permissions effect | width | height] '); $ Config- & gt; Set ('HTML.SafeIframe' is true); $ Config- & gt; Set ('URI.SafeIframeRegexp', '% ^ // (www.youtube.com/embed/playplayer.vimeo.com/video/)%'); $ Config- & gt; Set ('Cache.DefinitionImpl', null); // TODO: remove it later! break;   
 When accepting a YouTube video, the acceptable screen attribute is stripped of why?   
 
 
 The reason for this is that the attribute is not currently supported by safe iframe. You can support yourself using

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