Why run-time is always different from stepping into the codes?

[tinfanide]

Just recently I've posted the same file in this forum and now I've got another example that

the run-time result is just different from what I can get when I step into the codes pressing F8 every time. It drives me crazy cos it wastes all of my time (a few hours) to make sure the codes run well before run-time. When I press F5 to run it all, it just differs and I am totally frustrated here.

Please help take a look at the file (see the comments in the codes for the problem) and if you can walk me through this problem, I would be very thankful for your help. It does help me understand VBA far better.



Many thanks in advance.

[tinfanide]

Self solved.

Sub test()
Application.ScreenUpdating = False

ThisWorkbook.Activate
Worksheets("ApplicationData").Select

Dim IE As Object
Dim HTMLDoc As Object
Dim oRange As Range
Dim pos As Long

Set IE = CreateObject("InternetExplorer.Application")
IE.Visible = False

For Each cell In Selection.Cells

    IE.Navigate "http://www.chsc.hk/ssp/main.php?lang_id=1"
    While IE.readyState < 4
    Application.Wait DateAdd("s", 1 / 1000, Now)
    Wend
    Set HTMLDoc = IE.Document
    
    
    HTMLDoc.getElementById("sch_name").Value = Cells(cell.Row, 2).Value
    HTMLDoc.getElementById("btn_search").Click
    
                            
    Application.Wait DateAdd("s", 1, Now)
                            
                            
    For Each tr In HTMLDoc.getElementsByTagName("tr")
        If tr.className = "psp_table_line2_bgcolor" Then
            IE.Navigate tr.getElementsByTagName("a")(0).href
            Exit For
        End If
    Next
    
    Application.Wait DateAdd("s", 1, Now)
    
    Cells(cell.Row, 3).Value = HTMLDoc.getElementsByTagName("span")(3).innerText
    Cells(cell.Row, 4).Value = HTMLDoc.getElementsByTagName("td")(73).innerText

    Set oRange = Cells(cell.Row, 4).Find(What:="(", LookAt:=xlPart)
        
    If Not oRange Is Nothing Then
        pos = Application.WorksheetFunction.Find("(", Cells(cell.Row, 4).Value) - 1
        Cells(cell.Row, 4) = Trim(Left(Cells(cell.Row, 4).Value, pos))
    End If


Next cell


IE.Quit
Set IE = Nothing
Application.ScreenUpdating = True

End Sub

With the use of

 Application.Wait DateAdd("s", 1, Now)

Excel seems to have gone to the right page expected.
I don't know why waiting for the least of ONE second will get Excel extract data from the page designated.