[Bug 10816] New: i18n comment 11 : default ignorable code points


           Summary: i18n comment 11 : default ignorable code points
           Product: HTML WG
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: public-i18n-bidi@w3.org
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org, public-i18n-bidi@w3.org

Comment from the i18n review of:

Comment 11
At http://www.w3.org/International/reviews/html5-bidi/
Editorial/substantive: S
Tracked by: AL

Location in reviewed document:
undefined [http://dev.w3.org/html5/spec/spec.html#contents]

Comment:The HTML specification should require user agents to implement the
Unicode spec re Default Ignorable Code Points (Unicode Standard version 5.2,
Chapter 5 (http://unicode.org/versions/Unicode5.2.0/ch05.pdf), section 5.21),
including never displaying the directional formatting characters (LRM, RLM,
LRE, RLE, LRO, RLO, and PDF) inappropriately (e.g. as empty boxes or advance
widths) even if the underlying platform does not handle them properly. In
particular, this must be the case for script dialog text, page titles, and

Currently, directional formatting characters are most often displayed
inappropriately in these context, since user agents mostly rely on the
operating system to display the text in these contexts correctly, which does
not happen because most LTR users' machines do not have RTL characters support
installed. As a result, web applications are unable to use directional
formatting characters around LTR text to make sure it is displayed correctly in
an RTL context, since doing so will make it display incorrectly in the far more
common LTR context.

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Received on Wednesday, 29 September 2010 12:54:21 UTC