Fixes #1618: "getElementsByTagName('svg')" does not returns NodeList of SVGSVGElement, but generic NodeList.

[jsakamoto]

Fixes #1618

[mhegazy]

Thanks for the PR. This file is a result of a build, so in general you do not want to change the files in bin without changing the sources that generated them, as the next update to bin from a build will overwrite the changes. (copied from reply to PR #1592)

These overloads are auto-generated into src\lib\dom.generated.d.ts from IE's dom specifications. this makes it really easy for us to generated updated dom definitions. but it also makes it hard for hand editing it. we are looking into changing the process and making this file generated from a webidl definitions. this is however not in the immediate plan.

For this change, I can update the script that generates theses to add the svg overload.

[jsakamoto]

Thank you for your reply.

Wow, it is a result of a build.
It is my mistake, and exposes a lack of my understanding about the building process.

I understand it now, and I know the issue #1618 is assigned @mhegazy.
Thank you very much!