Why do those Thai characters display on the web page with a long tail?

Question

ด้้้้้็็็็็้้้้้็็็็็้้้้้็็็็็้้้้้็็็็็้้้้้็็็็็้้้้้็็็็็้้้้้็็็็็้้้้้дด็็็็็้้้้้็็็็้้้้้็็็็็้้้้้็็็็็้้้้้็็็็็้้้้้

I found some interesting characters just

Answer 1

You are never supposed to combine hundreds of unicode characters into one single graphical character, although unicode formats technically allow it; you usually combine not more than 2 or 3 characters.

In Thai, you have vowels and tone marks, which are displayed above the consonnant character (sometimes vowels appear below, or even around the consonnant characters...). It's a bit like accents over vowels in French (é, è...) or umlauts in German. It's not normal to have more than two such signs in Thai (and more than one in French or German). It means your input is illegal Thai text (maybe written to provide some funny graphical effects, like "ASCII art"). I'm not surprised that such illegal text is interpreted differently according to the browser.