| CssImport | 
 Provides a Css HEAD element for importing external Cascading
 Stylesheet files using the <link> tag. 
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| CssStyle | 
 Provides a Css HEAD element for including inline Cascading
 Stylesheets using the <style> tag. 
 | 
| Element | 
 Provides a base class for rendering HTML elements, for example
 JavaScript (<script>) and Cascading Stylesheets
 (<link> / <style>). 
 | 
| JsImport | 
 Provides a JavaScript HEAD element for importing external JavaScript
 files using the <script> tag. 
 | 
| JsScript | 
 Provides a HEAD element for including inline JavaScript using the
 <script> tag. 
 | 
| ResourceElement | 
 Provides a base class for rendering HEAD resources of an HTML page, for
 example JavaScript (<script>) and Cascading Stylesheets
 (<link>/<style>). 
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