Add 'PreferCSSPageSize' to PdfOptions (#634)

Author: kblok

lib/PuppeteerSharp/Page.cs

@@ -879,7 +879,8 @@ public async Task<byte[]> PdfDataAsync(PdfOptions options)
                 marginBottom,
                 marginLeft,
                 marginRight,
-                pageRanges = options.PageRanges
+                pageRanges = options.PageRanges,
+                preferCSSPageSize = options.PreferCSSPageSize
             }).ConfigureAwait(false);
 
             var buffer = Convert.FromBase64String(result.GetValue("data").Value<string>());

lib/PuppeteerSharp/PdfOptions.cs

@@ -71,5 +71,11 @@ public class PdfOptions
         /// Paper margins, defaults to none
         /// </summary>
         public MarginOptions MarginOptions { get; set; } = new MarginOptions();
+
+        /// <summary>
+        /// Give any CSS <c>@page</c> size declared in the page priority over what is declared in <c>width</c> and <c>height</c> or <c>format</c> options. 
+        /// Defaults to <c>false</c>, which will scale the content to fit the paper size.
+        /// </summary>
+        public bool PreferCSSPageSize { get; set; }
     }
 }