Single and double quotes together as HTML attribute value?

Question

We have a code like this:

echo \'\';

Absolutely it doesn\'t work b

Answer 1

To address the question in the title, there is no problem with using both " and ' in an attribute value. The problem arises in linearization of values, i.r. writing them in HTML markup (as opposite to generating them with client-side JavaScript). Then, if the value contains both " and ', either of them needs to be escaped, depending on which one you use as value delimiter.

You do not need to use entity references, though. The character references " and ' (or the equivalent decimal references) can be used, too.

In the case of the string

She said: "I don't know."

the correct English spelling is

She said: “I don’t know.”

Using the correct punctuation marks, no markup problem arises, since you can use the Ascii quotation mark " or the Ascii apostrophe as delimiter. They are meant for use in computer languages, not in human languages.