How do you select all options in HTML?
For windows: Hold down the control (ctrl) button to select multiple options. For Mac: Hold down the command button to select multiple options.
How to set value for select in HTML?
The default value of the select element can be set by using the 'selected' attribute on the required option. This is a boolean attribute. The option that is having the 'selected' attribute will be displayed by default on the dropdown list.