When using the "Output SVG inline" option and the "Sanitize SVG code" option together, the field formatter outputs an XML declaration, wich causes an HTML validation error.
Use "Output SVG inline" with "Sanitize SVG code" enabled. Take a look at the HTML DOM. There will be a XML declaration before the svg tag like:
<!--?xml version="1.0" encoding="UTF-8"?-->
Validate the markup with a validator like e.g. https://validator.w3.org/ and you will get the error: "Saw <?. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)"
Fixed
2.1
Code
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Issue #3281766 by jwilson3: Remove XML declaration from inline SVG data