Struct Environment 

pub struct Environment {
    pub inner_width: u32,
    pub inner_height: u32,
    pub device_pixel_ratio: u32,
    pub touch_points: u32,
    pub viewport_honoured: bool,
}

What the page actually saw, read back from the page itself.

Why this is recorded

Dimensions alone cannot tell you whether a screenshot is right. A capture can be exactly 1320x2868 and still show a desktop layout scaled into a phone frame, because a page served to a desktop User-Agent may declare <meta name="viewport" content="width=1120"> and Chrome honours it. Every size assertion passes; the image is useless.

So the run records the viewport and touch points the page reported, and callers can assert on the environment rather than only on the output.

Fields

inner_width: u32

window.innerWidth as the page saw it.

inner_height: u32

window.innerHeight as the page saw it.

device_pixel_ratio: u32

devicePixelRatio as the page saw it.

touch_points: u32

navigator.maxTouchPoints.

viewport_honoured: bool

Whether the layout viewport matched what was requested. False means the page overrode it, which usually means content negotiation served the wrong layout.

Trait Implementations

impl Clone for Environment

fn clone(&self) -> Environment

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Environment

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Environment

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Environment

impl PartialEq for Environment

fn eq(&self, other: &Environment) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for Environment

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Environment