Open IceFaces Showcase (http://composite-component-showcase.icesoft.org/icefaces-enterprise-comps-showcase/showcase.jsf) -> Selection Components -> Editable List

Enter normal characters (or any special character, including the German 'ß') in the input field, and monitor the Javascript Console coming with Firefox (F12 -> Console).

Output
{code}
DOM-Neuberechnung: 0ms
{code}

Enter a German Umlaut 'ä', 'ü', 'ö'
Output in Console:
{code}
POST http://composite-component-showcase.icesoft.org/icefaces-enterprise-comps-showcase/showcase.jsf [HTTP/1.1 200 OK 601ms]
"[window] full submit to http://composite-component-showcase.icesoft.org/icefaces-enterprise-comps-showcase/showcase.jsf
javax.faces.execute: @all
javax.faces.render: @all
javax.faces.source: frm:tabs:0:j_idt121
view ID: vhbbz5i5a
event type: keyup" bridge.js.jsf:1
"[window] applied updates >>
update["javax.faces.ViewState"]: 1040821979945183383:8221897622083850577....
eval: ice.applyFocus('frm:tabs:0:j_idt121');va....
extension"
{code}

We do server-side validation on each partial and full submit, which has a substantial impact on the performance if umlauts (which are very common in German texts) are included.