probably write it as a virus that jumps from webserver to webserver, doing nothing malicious but adding your HTML to a pre-determined route it will have to be

probably write it as a virus that jumps from webserver to webserver, doing nothing malicious but adding your HTML to a pre-determined route it will have to be a strong AI virus so it can keep rewriting itself as new software updates come along so you’re risking a skynet situation - oh! reminds me of the cowboy bebop episode where a hacked satellite entertains itself by drawing geoglyphs in the desert-definitely do that.