[Form] Use self-closing <input />
syntax again, reverting #47715
#53656
+44
−46
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This PR reverts #47715 and puts the trailing slash back into
<input .../>
markup in the form themes.The reasons are outlined in detail in #53649. Basically, the trailing slash in void elements like
<input>
is not required in HTML 5, yet it is perfectly valid and compliant with specs.Writing markup that way is required to parse and process it with an XML parser, like
libxml2
underlying all of the PHP DOM, XML etc. extensions.HTML 5 capable parser support has been added to PHP in php/php-src#12111 and will be available with PHP 8.4. So, we might want to remove the trailing slashes once Symfony requires at least PHP 8.4.