Html5 and css3 beginner knowledge point refining, html5css3 knowledge point
- Target: Specify the framework in the framework set to be installed in another resource. The attribute can be _ self, _ blank, _ top, and _ parent, it means to use itself, new window, top-level framework, and parent framework to load new resources.
- Alt only displays the prompt text when the image cannot be loaded.
- To get the best form performance, you can use the get method to send small forms with only a few brief bytes.
- Some server operating systems limit the number and length of command line parameters that can be passed to the application immediately. In this case, for forms with many fields or long text fields, the POST method should be used for sending.
- If security is a problem, we recommend that you use the POST method. The GET method places the form parameters directly in the application URL, so that network visitors can easily capture them and extract them from the server's log files. If the parameter contains sensitive information such as a credit card account, the user's security will be compromised without knowing it. The POST application does not have security vulnerabilities. You can at least encrypt the parameters when transmitting them to the server as separate transactions.
- If you want to call the server-side application outside the form and include the process of passing parameters to it, you must use the GET method, because this method allows parameters such as the form to be included as part of the URL. On the other hand, the POST-style applications hope that there will be an additional transfer process from the browser after the URL, where the transmitted content cannot be used as the content of the traditional <a> label.
- The page is automatically played when video and audio are played in embad.
- In terms of adjusting the container size, embed is blunt to change its width and height. The video tag scales proportionally, and you change the width to the height.
- For the audio label, there is only the width attribute. When the height is changed, the display format is to adjust its height relative to the container.
- In the above Code, because the user's gender can only be "male" or "female", when one of the radio buttons is selected, the other one cannot be selected. To implement this function, you can set the name attribute value of the single-choice button to the same.
