1323722 - symbol in wrong position

Status: VERIFIED INVALID

(Core :: SVG, defect)

Description

[Rainald62]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
Build ID: 20161208153507

Steps to reproduce:

Have a look at
https://upload.wikimedia.org/wikipedia/commons/archive/9/9d/20161215011430%21Spherical_wave_lens.svg


Actual results:

One of three arrowheads is placed correctly, one is slightly too low, the third is not visible at all. The behaviour was correct (in Firefox and IE9) when I designed the image in 2012, file history is 
https://commons.wikimedia.org/wiki/File:Spherical_wave_lens.svg


Expected results:

Arrowheads at the end of the three rays, as rendered by rsvg in 2012:
https://upload.wikimedia.org/wikipedia/commons/thumb/archive/9/9d/20161215011430%21Spherical_wave_lens.svg/120px-Spherical_wave_lens.svg.png
or in the current version of the svg (using a marker instead of a symbol):
https://upload.wikimedia.org/wikipedia/commons/9/9d/Spherical_wave_lens.svg

Comment 1

[Andre Klapper]

Confirming on Firefox 50 on Linux. For comparison, https://upload.wikimedia.org/wikipedia/commons/archive/9/9d/20161215011430%21Spherical_wave_lens.svg renders correctly in Chromium 54.

Comment 2

[Loic]

Reproducible in old versions of Firefox like FF12.

Comment 3

[Robert Longson [:longsonr]]

You're not allowed to have spaces in attributes so y=" -4" is invalid and treated as y="0"

Chrome's rendering is actually incorrect per the SVG specification.

Comment 4

[Rainald62]

Do you have a reference into the SVG spec? I have read it only partially.
By the way, http://validator.w3.org/check?uri=https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Farchive%2F9%2F9d%2F20161215011430%21Spherical_wave_lens.svg says "Valid SVG 1.1"

Comment 5

[Robert Longson [:longsonr]]

That validator does not check for the values of attributes IIRC.

The definition of number is here: https://www.w3.org/TR/SVG/types.html#BasicDataTypes it does not provide for the possibility of whitespace anywhere in it i.e.

When a <length> is used in an SVG presentation attribute, the syntax must match the following pattern:

length ::= number ("em" | "ex" | "px" | "in" | "cm" | "mm" | "pt" | "pc" | "%")?

The unit identifier, if present, must be in lower case; if not present, the length value represents a distance in the current user coordinate system.

Comment 6

[Rainald62]

Thank you. I see that the patterns given there do care about whitespace where appropriate.
I will check all my SVG files.

Comment 7

[Rainald62]

(In reply to Robert Longson from comment #5)
> https://www.w3.org/TR/SVG/types.html#BasicDataTypes

In addition, I found
https://www.w3.org/TR/SVG/paths.html#PathDataBNF
Path data allows leading whitespace. So at least the current version 
https://upload.wikimedia.org/wikipedia/commons/9/9d/Spherical_wave_lens.svg
is correct.

What about an error message for whitespace where whitespace is not allowed?
The requirement
https://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing
is not normative, but it would be nice.

Comment 8

[Robert Longson [:longsonr]]

Check Firefox's error console, you'll find you already get one.