HTML span div tutorial example explained# HTML # span #div. ... <看更多>

You are almost there! Style selectors need to match exactly, so you have a typo in your font weight being numeric 600 rather than bold ... ... <看更多>

Are you using a WYSIWYG module like "CKEditor - WYSIWYG HTML"? It appears to be this module or the CKEditor itself that is wrongly stripping out ... ... <看更多>

If you want to copy only the text you need to use CTRL+SHIFT+V. This will paste the selected text as plain text. Also, you can use the Trumbowyg ... ... <看更多>