Error Detection Creates False Positives if Non-US Keyboard Characters Used

In our class today a student's chromebook was, for some reason, set to use the international keyboard setting.

As a result she got an error nag about needing to use "s for her href attribute because the double-quotes were typed with international characters. The tag was visibly correct. Switching the chromebook to US Keyboard setting fixed the issue with visibly different " characters in the IDE.

Valid: <img src="//placekitten.com/100/100">
Not valid (US international keyboard): <img src=¨//placekitten.com/100/100¨>

The W3C validator gives the following error for on that character:

Line 2, Column 18: an attribute value must be a literal unless it contains only name characters
<img src=¨//placekitten.com/100/100¨>
✉
You have used a character that is not considered a "name character" in an attribute value. Which characters are considered "name characters" varies between the different document types, but a good rule of thumb is that unless the value contains only lower or upper case letters in the range a-z you must put quotation marks around the value. In fact, unless you have extreme file size requirements it is a very very good idea to always put quote marks around your attribute values. It is never wrong to do so, and very often it is absolutely necessary.

https://github.com/popcodeorg/popcode/issues/179

未指定源文件或测试。以 issue #179 为背景，在编辑器中重现所报告的代码片段，并跟踪针对国际键盘引号字符的错误检测路径；当看起来有效的输入不再产生误报，同时真正无效的标记仍会被报告时，即表示完成。