I want to make a game with a HD 720p resolution, but I also want that game to be played in browser (HTML5 export) with a resolution of 800x450.
How can I scale down the 1280×720 game when exporting it for web?
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If I understand you correctly all you need to do is select the project root from the projects window on the right, then from the properties bar on the left set fullscreen scaling to "letterbox scale".
There are different ways to scale or crop game and it's all explained here https://www.scirra.com/tutorials/73/supporting-multiple-screen-sizes
So I just set the game to "Letterbox Scale" and then set game dimensions to 800x450 on the game´s HTML page?
Sounds logical, I will test it.
Thanks a lot for your help!!!