Hi Erel,Question is solved,many tks for your advice. but i don't add it in the html string but use js. Code show as below:
B4X:
Sub WKWebview_PageFinished (Success As Boolean, Url As String)
WKWebview.EvaluateJavaScript("tag", "var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('tagname')[0].appendChild(meta);")
End Sub
tagname:including table,head,body,html etc in html string.