Custom Elements: Complete HTMLConstructor Algorithm

third_party/WebKit/Source/bindings/IDLExtendedAttributes.md

 # Blink IDL Extended Attributes
 
 [TOC]
 
 ## Introduction
 
 The main interest in extended attributes are their _semantics_: Blink implements many more extended attributes than the Web IDL standard, to specify various behavior.
 
 The authoritative list of allowed extended attributes and values is [bindings/IDLExtendedAttributes.txt](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/bindings/IDLExtendedAttributes.txt). This is complete but not necessarily precise (there may be unused extended attributes or values), since validation is run on build, but coverage isn't checked.
 
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 These extended attributes must either take no arguments or take an identifier list.
 
 If the `[Global]` or `[PrimaryGlobal]` extended attribute is declared with an identifier list argument, then those identifiers are the interface’s global names; otherwise, the interface has a single global name, which is the interface's identifier.
 
 ### [HTMLConstructor]
 
 Standard: [HTMLConstructor](https://html.spec.whatwg.org/multipage/dom.html#html-element-constructors)
 
 Summary: HTML Elements have special constructor behavior. Interface object of given interface with the `[HTMLConstructor]` attribute will have specific behavior when called.
 
-Usage: Must take no arguments, and must not appear on anything other than an interface. It much appear once on an interface, and the interface cannot be annotated with `[Constructor]` or `[NoInterfaceObject]` extended attributes. It must not be used on a callback interface.
+Usage: Must take no arguments, and must not appear on anything other than an interface. It must appear once on an interface, and the interface cannot be annotated with `[Constructor]` or `[NoInterfaceObject]` extended attributes. It must not be used on a callback interface.
 
 ### [NamedConstructor] _(i)_
 
 Standard: [NamedConstructor](https://heycam.github.io/webidl/#NamedConstructor)
 
 Summary: If you want to allow JavaScript to create a DOM object of XXX using a different name constructor (i.e. allow JavaScript to create an XXX object using "new YYY()", where YYY != XXX), you can use `[NamedConstructor]`.
 
 Usage: The possible usage is `[NamedConstructor=YYY(...)]`. Just as with constructors, an empty argument list can be omitted, as: `[NamedConstructor=YYY]`. `[NamedConstructor]` can be specified on interfaces. The spec allows multiple named constructors, but the Blink IDL compiler currently only supports at most one.
 
 ```webidl
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