Auto merge of #23472 - ffwff:master, r=cybai

Add value sanitization for input[type=email]

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Add value sanitization for input[type=email] as per the [HTML specification](https://html.spec.whatwg.org/multipage/input.html#e-mail-state-(type=email)).

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix part of #21810 (GitHub issue number if applicable)

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- [x] There are tests for these changes

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components/script/dom/htmlinputelement.rs

@@ -63,7 +63,7 @@ use std::cell::Cell;
 use std::ops::Range;
 use style::attr::AttrValue;
 use style::element_state::ElementState;
-use style::str::split_commas;
+use style::str::{split_commas, str_join};
 
 const DEFAULT_SUBMIT_VALUE: &'static str = "Submit";
 const DEFAULT_RESET_VALUE: &'static str = "Reset";
@@ -1195,6 +1195,24 @@ impl HTMLInputElement {
             InputType::Range => {
                 value.set_best_representation_of_the_floating_point_number();
             },
+            InputType::Email => {
+                if !self.Multiple() {
+                    value.strip_newlines();
+                    value.strip_leading_and_trailing_ascii_whitespace();
+                } else {
+                    let sanitized = str_join(
+                        split_commas(value).map(|token| {
+                            let mut token = DOMString::from_string(token.to_string());
+                            token.strip_newlines();
+                            token.strip_leading_and_trailing_ascii_whitespace();
+                            token
+                        }),
+                        ",",
+                    );
+                    value.clear();
+                    value.push_str(sanitized.as_str());
+                }
+            },
             _ => (),
         }
     }