diff --git a/README.md b/README.md
index 674bb0b..61422aa 100644
--- a/README.md
+++ b/README.md
@@ -39,9 +39,11 @@ For a tutorial and usage overview, take a look at the
     * [Stepping](#stepping)
     * [Variables and scopes](#variables-and-scopes)
     * [Watches](#watches)
+       * [Watch autocompletion](#watch-autocompletion)
     * [Stack Traces](#stack-traces)
     * [Program Output](#program-output)
        * [Console](#console)
+       * [Console autocompletion](#console-autocompletion)
        * [Log View](#log-view)
     * [Closing debugger](#closing-debugger)
  * [Debug adapter configuration](#debug-adapter-configuration)
@@ -77,7 +79,7 @@ For a tutorial and usage overview, take a look at the
  * [License](#license)
  * [Sponsorship](#sponsorship)
 
-<!-- Added by: ben, at: Tue  1 Sep 2020 13:42:32 BST -->
+<!-- Added by: ben, at: Fri  4 Sep 2020 00:48:17 BST -->
 
 <!--te-->
 
@@ -109,10 +111,10 @@ And a couple of brief demos:
 - launch and attach
 - remote launch, remote attach
 - locals and globals display
-- watch expressions
+- watch expressions with autocompletion
 - call stack display and navigation
 - variable value display hover
-- interactive debug console
+- interactive debug console with autocompletion
 - launch debugee within Vim's embedded terminal
 - logging/stdout display
 - simple stable API for custom tooling (e.g. integrate with language server)
@@ -742,6 +744,22 @@ to add a new watch expression.
 
 The watches are represented by the buffer `vimspector.StackTrace`.
 
+### Watch autocompletion
+
+The watch prompt buffer  has its `omnifunc` set to a function that will
+calcualte completion for the current expression. This is trivailly used with
+`<Ctrl-x><Ctrl-o>` (see `:help ins-completion`), or integrated with your
+favourite completion system. The filetype in the buffer is set to
+`VimspectorPrompt`.
+
+For YouCompleteMe, the following config works well:
+
+```viml
+let g:ycm_semantic_triggers =  {
+  \   'VimspectorPrompt': [ '.', '->', ':', '<' ]
+}
+```
+
 ## Stack Traces
 
 * In the threads window, use `<CR>` to expand/collapse.
@@ -782,6 +800,22 @@ NOTE: See also [Watches](#watches) above.
 If the output window is closed, a new one can be opened with
 `:VimspectorShowOutput Console`.
 
+### Console autocompletion
+
+The console prompt buffer has its `omnifunc` set to a function that will
+calcualte completion for the current command/expression. This is trivailly used
+with `<Ctrl-x><Ctrl-o>` (see `:help ins-completion`), or integrated with your
+favourite completion system. The filetype in the buffer is set to
+`VimspectorPrompt`.
+
+For YouCompleteMe, the following config works well:
+
+```viml
+let g:ycm_semantic_triggers =  {
+  \   'VimspectorPrompt': [ '.', '->', ':', '<' ]
+}
+```
+
 ### Log View
 
 The Vimspector log file contains a full trace of the communication between
diff --git a/autoload/vimspector.vim b/autoload/vimspector.vim
index 302b34d..c1f3640 100644
--- a/autoload/vimspector.vim
+++ b/autoload/vimspector.vim
@@ -19,6 +19,13 @@ let s:save_cpo = &cpoptions
 set cpoptions&vim
 " }}}
 
+function! s:Debug( ... ) abort
+  py3 <<EOF
+if _vimspector_session is not None:
+  _vimspector_session._logger.debug( *vim.eval( 'a:000' ) )
+EOF
+endfunction
+
 
 let s:enabled = vimspector#internal#state#Reset()
 
@@ -232,17 +239,156 @@ function! vimspector#CompleteOutput( ArgLead, CmdLine, CursorPos ) abort
   return join( buffers, "\n" )
 endfunction
 
+py3 <<EOF
+def _vimspector_GetExprCompletions( ArgLead, prev_non_keyword_char ):
+  if not _vimspector_session:
+    return []
+
+  items = []
+  for candidate in _vimspector_session.GetCompletionsSync(
+    ArgLead,
+    prev_non_keyword_char ):
+
+    label = candidate.get( 'text', candidate[ 'label' ] )
+
+    start = prev_non_keyword_char - 1
+
+    if 'start' in candidate and 'length' in candidate:
+      start = candidate[ 'start' ]
+
+    items.append( ArgLead[ 0 : start ] + label )
+
+  return items
+EOF
+
 function! vimspector#CompleteExpr( ArgLead, CmdLine, CursorPos ) abort
   if !s:enabled
     return
   endif
-  return join( py3eval( '_vimspector_session.GetCompletionsSync( '
-                      \.'  vim.eval( "a:CmdLine" ),'
-                      \.'  int( vim.eval( "a:CursorPos" ) ) )'
-                      \. '   if _vimspector_session else []' ),
+
+  let col = len( a:ArgLead )
+  let prev_non_keyword_char = match( a:ArgLead[ 0 : col - 1 ], '\k*$' ) + 1
+
+  return join( py3eval( '_vimspector_GetExprCompletions( '
+                      \ . 'vim.eval( "a:ArgLead" ), '
+                      \ . 'int( vim.eval( "prev_non_keyword_char" ) ) )' ),
              \ "\n" )
 endfunction
 
+let s:latest_completion_request = {}
+
+function! vimspector#CompleteFuncSync( prompt, find_start, query ) abort
+  if py3eval( 'not _vimspector_session' )
+    if a:find_start
+      return -3
+    endif
+    return v:none
+  endif
+
+  if a:find_start
+
+    " We're busy
+    if !empty( s:latest_completion_request )
+      return -3
+    endif
+
+    let line = getline( line( '.' ) )[ len( a:prompt ) : ]
+    let col = col( '.' ) - len( a:prompt )
+
+    " It seems that most servers don't implement the 'start' parameter, which is
+    " clearly necessary, as they all seem to assume a specific behaviour, which
+    " is undocumented.
+
+    let s:latest_completion_request.items =
+          \ py3eval( '_vimspector_session.GetCompletionsSync( '
+                   \.'  vim.eval( "line" ), '
+                   \.'  int( vim.eval( "col" ) ) )' )
+
+    let s:latest_completion_request.line = line
+    let s:latest_completion_request.col = col
+
+    let prev_non_keyword_char = match( line[ 0 : col - 1 ], '\k*$' ) + 1
+    let query_len = col - prev_non_keyword_char
+
+    let start_pos = col
+    for item in s:latest_completion_request.items
+      if !has_key( item, 'start' ) || !has_key( item, 'length' )
+        " The specification states that if start is not supplied, isertion
+        " should be at the requested column. But about 0 of the servers actually
+        " implement that
+        " (https://github.com/microsoft/debug-adapter-protocol/issues/138)
+        let item.start = prev_non_keyword_char
+        let item.length = query_len
+      else
+        " For some reason, the returned start value is 0-indexed even though we
+        " use columnsStartAt1
+        let item.start += 1
+      endif
+
+      if !has_key( item, 'text' )
+        let item.text = item.label
+      endif
+
+      if item.start < start_pos
+        let start_pos = item.start
+      endif
+    endfor
+
+    let s:latest_completion_request.start_pos = start_pos
+    let s:latest_completion_request.prompt = a:prompt
+
+    " call s:Debug( 'FindStart: %s', {
+    "       \ 'line': line,
+    "       \ 'col': col,
+    "       \ 'prompt': len( a:prompt ),
+    "       \ 'start_pos': start_pos,
+    "       \ 'returning': ( start_pos + len( a:prompt ) ) - 1,
+    "       \ } )
+
+    " start_pos is 1-based and the return of findstart is 0-based
+    return ( start_pos + len( a:prompt ) ) - 1
+  else
+    let items = []
+    let pfxlen = len( s:latest_completion_request.prompt )
+    for item in s:latest_completion_request.items
+      if item.start > s:latest_completion_request.start_pos
+        " fix up the text (insert anything that is already present in the line
+        " that would be erased by the fixed-up earlier start position)
+        "
+        " both start_pos and item.start are 1-based
+        let item.text = s:latest_completion_request.line[
+              \ s:latest_completion_request.start_pos + pfxlen - 1 :
+              \  item.start + pfxlen - 1 ] . item.text
+      endif
+
+      if item.length > len( a:query )
+        " call s:Debug( 'Rejecting %s, length is greater than %s',
+        "       \ item,
+        "       \ len( a:query ) )
+        continue
+      endif
+
+      call add( items, { 'word': item.text,
+                       \ 'abbr': item.label,
+                       \ 'menu': get( item, 'type', '' ),
+                       \ 'icase': 1,
+                       \ } )
+    endfor
+    let s:latest_completion_request = {}
+
+    " call s:Debug( 'Items: %s', items )
+    return { 'words': items, 'refresh': 'always' }
+  endif
+endfunction
+
+function! vimspector#OmniFuncWatch( find_start, query ) abort
+  return vimspector#CompleteFuncSync( 'Expression: ', a:find_start, a:query )
+endfunction
+
+function! vimspector#OmniFuncConsole( find_start, query ) abort
+  return vimspector#CompleteFuncSync( '> ', a:find_start, a:query )
+endfunction
+
 function! vimspector#Install( bang, ... ) abort
   if !s:enabled
     return
diff --git a/autoload/vimspector/internal/neopopup.vim b/autoload/vimspector/internal/neopopup.vim
index 148107c..fe5fe05 100644
--- a/autoload/vimspector/internal/neopopup.vim
+++ b/autoload/vimspector/internal/neopopup.vim
@@ -26,24 +26,39 @@ set cpoptions&vim
 let s:db = {}
 let s:next_id = 0
 
+
+function! s:MessageToList( message ) abort
+  if type( a:message ) == type( [] )
+    let message = a:message
+  else
+    let message = [ a:message ]
+  endif
+  return message
+endfunction
+
+function! s:GetSplashConfig( message ) abort
+  let l = max( map( a:message, 'len( v:val )' ) )
+  let h = len( a:message )
+
+  return { 'relative':   'editor',
+         \ 'width':      l,
+         \ 'height':     h,
+         \ 'col':        ( &columns / 2 ) - ( l / 2 ),
+         \ 'row':        ( &lines / 2 ) - h / 2,
+         \ 'anchor':     'NW',
+         \ 'style':      'minimal',
+         \ 'focusable':  v:false,
+         \ }
+endfunction
+
 function! vimspector#internal#neopopup#DisplaySplash( message ) abort
+  let message = s:MessageToList( a:message )
   let buf = nvim_create_buf(v:false, v:true)
-  call nvim_buf_set_lines(buf, 0, -1, v:true, [ a:message ] )
+  call nvim_buf_set_lines(buf, 0, -1, v:true, message )
 
-  let l = len( a:message )
-
-  let opts = {
-        \ 'relative':   'editor',
-        \ 'width':      l,
-        \ 'height':     1,
-        \ 'col':        ( &columns / 2 ) - ( l / 2 ),
-        \ 'row':        &lines / 2,
-        \ 'anchor':     'NW',
-        \ 'style':      'minimal',
-        \ 'focusable':  v:false,
-        \ }
-  let win = nvim_open_win(buf, 0, opts)
+  let win = nvim_open_win(buf, 0, s:GetSplashConfig( message ) )
   call nvim_win_set_option(win, 'wrap', v:false)
+  call nvim_win_set_option(win, 'colorcolumn', '')
 
   let id = s:next_id
   let s:next_id += 1
@@ -53,7 +68,9 @@ endfunction
 
 function! vimspector#internal#neopopup#UpdateSplash( id, message ) abort
   let splash = s:db[ a:id ]
-  call nvim_buf_set_lines(splash.buf, 0, -1, v:true, [ a:message ] )
+  let message = s:MessageToList( a:message )
+  call nvim_buf_set_lines( splash.buf, 0, -1, v:true, message )
+  call nvim_win_set_config( splash.win, s:GetSplashConfig( message ) )
   return a:id
 endfunction
 
diff --git a/python3/vimspector/debug_session.py b/python3/vimspector/debug_session.py
index 5a542c6..3956d7f 100644
--- a/python3/vimspector/debug_session.py
+++ b/python3/vimspector/debug_session.py
@@ -554,8 +554,7 @@ class DebugSession( object ):
     # TODO:
     #  - start / length
     #  - sortText
-    return [ i.get( 'text' ) or i[ 'label' ]
-             for i in response[ 'body' ][ 'targets' ] ]
+    return response[ 'body' ][ 'targets' ]
 
 
   def _SetUpUI( self ):
@@ -941,13 +940,26 @@ class DebugSession( object ):
     if 'name' not in launch_config:
       launch_config[ 'name' ] = 'test'
 
+    def failure_handler( reason, msg ):
+      text = [
+        'Launch Failed',
+        '',
+        reason,
+        '',
+        'Use :VimspectorReset to close'
+      ]
+      self._splash_screen = utils.DisplaySplash( self._api_prefix,
+                                                 self._splash_screen,
+                                                 text )
+
+
     self._connection.DoRequest(
       lambda msg: self._OnLaunchComplete(),
       {
         'command': launch_config[ 'request' ],
         'arguments': launch_config
-      }
-    )
+      },
+      failure_handler )
 
 
   def _OnLaunchComplete( self ):
diff --git a/python3/vimspector/gadgets.py b/python3/vimspector/gadgets.py
index 7e1d619..21073f1 100644
--- a/python3/vimspector/gadgets.py
+++ b/python3/vimspector/gadgets.py
@@ -407,14 +407,14 @@ GADGETS = {
       'url': 'https://marketplace.visualstudio.com/_apis/public/gallery/'
              'publishers/msjsdiag/vsextensions/'
              'debugger-for-chrome/${version}/vspackage',
-      'target': 'msjsdiag.debugger-for-chrome-4.12.0.vsix.gz',
+      'target': 'msjsdiag.debugger-for-chrome-4.12.10.vsix.gz',
       'format': 'zip.gz',
     },
     'all': {
-      'version': '4.12.0',
-      'file_name': 'msjsdiag.debugger-for-chrome-4.12.0.vsix',
+      'version': '4.12.10',
+      'file_name': 'msjsdiag.debugger-for-chrome-4.12.10.vsix',
       'checksum':
-        '0df2fe96d059a002ebb0936b0003e6569e5a5c35260dc3791e1657d27d82ccf5'
+        ''
     },
     'adapters': {
       'chrome': {
diff --git a/python3/vimspector/output.py b/python3/vimspector/output.py
index 90df09d..71c81e9 100644
--- a/python3/vimspector/output.py
+++ b/python3/vimspector/output.py
@@ -192,7 +192,8 @@ class OutputView( object ):
         utils.SetUpPromptBuffer( tab_buffer.buf,
                                  name,
                                  '> ',
-                                 'vimspector#EvaluateConsole' )
+                                 'vimspector#EvaluateConsole',
+                                 'vimspector#OmniFuncConsole' )
       else:
         utils.SetUpHiddenBuffer( tab_buffer.buf, name )
 
diff --git a/python3/vimspector/utils.py b/python3/vimspector/utils.py
index 17c8166..2874635 100644
--- a/python3/vimspector/utils.py
+++ b/python3/vimspector/utils.py
@@ -135,7 +135,7 @@ def SetUpHiddenBuffer( buf, name ):
   buf.name = name
 
 
-def SetUpPromptBuffer( buf, name, prompt, callback ):
+def SetUpPromptBuffer( buf, name, prompt, callback, omnifunc ):
   # This feature is _super_ new, so only enable when available
   if not Exists( '*prompt_setprompt' ):
     return SetUpHiddenBuffer( buf, name )
@@ -148,6 +148,7 @@ def SetUpPromptBuffer( buf, name, prompt, callback ):
   buf.options[ 'buflisted' ] = False
   buf.options[ 'bufhidden' ] = 'hide'
   buf.options[ 'textwidth' ] = 0
+  buf.options[ 'omnifunc' ] = omnifunc
   buf.name = name
 
   vim.eval( "prompt_setprompt( {0}, '{1}' )".format( buf.number,
@@ -156,6 +157,12 @@ def SetUpPromptBuffer( buf, name, prompt, callback ):
     buf.number,
     Escape( callback ) ) )
 
+  # This serves a few purposes, mainly to ensure that completion systems have
+  # something to work with. In particular it makes YCM use its identifier engine
+  # and you can config ycm to trigger semantic (annoyingly, synchronously) using
+  # some let g:ycm_auto_trggier
+  Call( 'setbufvar', buf.number, '&filetype', 'VimspectorPrompt' )
+
 
 def SetUpUIWindow( win ):
   win.options[ 'wrap' ] = False
diff --git a/python3/vimspector/variables.py b/python3/vimspector/variables.py
index d82090a..5694e46 100644
--- a/python3/vimspector/variables.py
+++ b/python3/vimspector/variables.py
@@ -147,7 +147,8 @@ class VariablesView( object ):
     utils.SetUpPromptBuffer( self._watch.buf,
                              'vimspector.Watches',
                              'Expression: ',
-                             'vimspector#AddWatchPrompt' )
+                             'vimspector#AddWatchPrompt',
+                             'vimspector#OmniFuncWatch' )
     with utils.LetCurrentWindow( watches_win ):
       vim.command(
         'nnoremap <buffer> <CR> :call vimspector#ExpandVariable()<CR>' )
diff --git a/support/test/bash/test_script b/support/test/bash/test_script
new file mode 100644
index 0000000..4e27bd9
--- /dev/null
+++ b/support/test/bash/test_script
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+function Test() {
+  echo $1
+}
+
+for i in "$@"; do
+  Test $i
+done
diff --git a/support/test/chrome/run_server b/support/test/chrome/run_server
new file mode 100755
index 0000000..9e5b569
--- /dev/null
+++ b/support/test/chrome/run_server
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+php -S localhost:1234 -t www
diff --git a/support/test/chrome/www/js/test.js b/support/test/chrome/www/js/test.js
index 273804e..9c1c4a1 100644
--- a/support/test/chrome/www/js/test.js
+++ b/support/test/chrome/www/js/test.js
@@ -6,5 +6,12 @@ $( document ).ready( function() {
     return msg;
   };
 
-  alert( 'test: ' + getMessage() );
+  var obj = {
+    test: getMessage(),
+    toast: function() { return 'egg'; },
+    spam: 'ham'
+  };
+
+  alert( 'test: ' + obj.test );
+  alert( 'toast: ' + obj.toast() );
 } );
diff --git a/support/test/node/simple/simple.js b/support/test/node/simple/simple.js
index fc6e558..77b8e32 100644
--- a/support/test/node/simple/simple.js
+++ b/support/test/node/simple/simple.js
@@ -1,3 +1,10 @@
 var msg = 'Hello, world!'
 
-console.log( "OK stuff happened" )
+var obj = {
+  test: 'testing',
+  toast: function() {
+    return 'toasty' . this.test;
+  }
+}
+
+console.log( "OK stuff happened " + obj.toast() )
diff --git a/tests/tabpage.test.vim b/tests/tabpage.test.vim
index 6772c66..1a5b1bc 100644
--- a/tests/tabpage.test.vim
+++ b/tests/tabpage.test.vim
@@ -71,12 +71,8 @@ function! Test_All_Buffers_Deleted_NoHidden()
 
   let buffers_after = getbufinfo( opts )
 
-  if assert_equal( len( buffers_before ), len( buffers_after ) )
-    call assert_report( 'Expected '
-                      \ . string( buffers_before )
-                      \ . ' but found '
-                      \ . string( buffers_after ) )
-  endif
+  call WaitForAssert( {->
+        \ assert_equal( len( buffers_before ), len( buffers_after ) ) } )
 
   set hidden&
   lcd -
@@ -106,12 +102,8 @@ function! Test_All_Buffers_Deleted_Hidden()
 
   let buffers_after = getbufinfo( opts )
 
-  if assert_equal( len( buffers_before ), len( buffers_after ) )
-    call assert_report( 'Expected '
-                      \ . string( buffers_before )
-                      \ . ' but found '
-                      \ . string( buffers_after ) )
-  endif
+  call WaitForAssert( {->
+        \ assert_equal( len( buffers_before ), len( buffers_after ) ) } )
 
   set hidden&
   lcd -
@@ -126,12 +118,8 @@ function! Test_All_Buffers_Deleted_ToggleLog()
   VimspectorToggleLog
   let buffers_after = getbufinfo( #{ buflisted: 1 } )
 
-  if assert_equal( len( buffers_before ), len( buffers_after ) )
-    call assert_report( 'Expected '
-                      \ . string( buffers_before )
-                      \ . ' but found '
-                      \ . string( buffers_after ) )
-  endif
+  call WaitForAssert( {->
+        \ assert_equal( len( buffers_before ), len( buffers_after ) ) } )
 
   call vimspector#test#setup#Reset()
   set hidden&
@@ -158,12 +146,8 @@ function! Test_All_Buffers_Deleted_Installer()
         \ 120000 )
 
   let buffers_after = getbufinfo( #{ buflisted: 1 } )
-  if assert_equal( len( buffers_before ), len( buffers_after ) )
-    call assert_report( 'Expected '
-                      \ . string( buffers_before )
-                      \ . ' but found '
-                      \ . string( buffers_after ) )
-  endif
+  call WaitForAssert( {->
+        \ assert_equal( len( buffers_before ), len( buffers_after ) ) } )
 
   call vimspector#test#setup#Reset()
   set hidden&