Project facet wst.web has not been defined.
It is used in plugin org.eclipse.jst.common.project.facet.core.
●WST(Web Standard Tools)
HTML、CSS、JavaScript、XML、XSD、DTDの各種エディタ
Internet、Validation(内蔵ブラウザはSDKに含まれる)
WSDL、Web Service Explorer、UDDI Query
Data Tools、SQL Scrapbook