Normally, DoS is done to block a server, not to freeze a client.

But there are 100 better ways if you are evil and really think about being mad on anyone

html is markup langauge, how you want ddos with it

well, if you were to create a html page that would be so large (and containing millions of divs), it would drain both the bandwidth(extremely tiny amount) and some CPU power, add some CSS to those millions of divs (CSS3 transform) and it would probably freeze/crash.

Technically it's not a DDoS, but it'll deny your browser (=service?), thus being a DoS somewhat.

Similar to SQL injection there is also the security term HTML injection where, for example, you XSS is prevented, but you can still add arbitrary HTML and through that run some Phishing eg on a forum, for instance, you place a well-formatted login form in your post but the form is heading to your server so when they fill it, you got their login anyway.

Teeworlds server don't have scripting language such as pawno or lua?

Unfortunately teeworlds has no scripting possibilites whatsoever :/
I've heard that there could possibly be some client around which had stuff like that, but I haven't come across a public server modification that makes use of that awesome stuff.

So if you want to have your very own custom server doing special things you want it to do, there appears to be no other way than getting your hands on the c++ sourcecode (or asking somebody else to do it for you, if you can't...)

...I know someone who wanted to code such a server with lua support and maybe even the whole gamemodes's logic built upon lua scripts, which would make it quite interesting (and easier for people who aren't that good with c++) to develop new mods on this system..... but the lack of time is real :(

Most modifications don't require a modified client. Some have mild user-experience fixes (ddrace for example with hook-through predict)

You don't so much install modifications so much as you just change what server executable you're using. TW+ is a popular mod with support for many modes.

Okay, thanks, for example i want every 5 minutes write in chat:
Thanks for playing on our server.
I need to build teesrv from sources?

Teeworlds server don't have scripting language such as pawno or lua?

You don't so much install modifications so much as you just change what server executable you're using. TW+ is a popular mod with support for many modes.