What changes in syntax or standards may impact the use of single quotes as attribute value delimiters in XHTML or HTML?

In XHTML or HTML, using single quotes as attribute value delimiters may cause issues if the syntax or standards change to require double quotes for attribute values. To ensure compatibility and adherence to standards, it is recommended to consistently use double quotes for attribute values in XHTML or HTML. 

// Use double quotes for attribute values in XHTML or HTML
$html = '<a href="https://www.example.com">Click here</a>';
echo $html;

Keywords

XHTML HTML syntax changes attribute values single quotes

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